The CARROLL AIRPORT COMMISSION, Appellee, v. Loren W. DANNER and Pan Danner, Appellants. , 927 N.W.2d 635 ( 2019 )


Menu:
  •                 IN THE SUPREME COURT OF IOWA
    No. 17–1458
    Filed May 10, 2019
    THE CARROLL AIRPORT COMMISSION,
    Appellee,
    vs.
    LOREN W. DANNER and PAN DANNER,
    Appellants.
    On review from the Iowa Court of Appeals.
    Appeal from the Iowa District Court for Carroll County, William C.
    Ostlund, Judge.
    A farmer seeks further review of a court of appeals decision
    declining to give preemptive effect to a no-hazard determination by the
    Federal Aviation Administration. DECISION OF COURT OF APPEALS
    VACATED; DISTRICT COURT JUDGMENT AFFIRMED AS MODIFIED.
    Steven D. Hamilton of Hamilton Law Firm, P.C., Storm Lake, for
    appellants.
    Gina C. Badding of Neu, Minnich, Comito, Halbur, Neu & Badding,
    P.C., Carroll, for appellee.
    2
    WATERMAN, Justice.
    In this appeal, we must determine the legal effect of a “no hazard”
    letter issued by the Federal Aviation Administration (FAA) to a farmer
    who built a twelve-story grain leg (bucket elevator) near an airport. The
    structure intrudes sixty feet into airspace restricted for aviation.
    Construction was well underway when a member of the local airport
    commission cried foul. The airport commission informed the farmer he
    needed a variance and refused to grant one, without waiting for input
    from federal officials.   Shortly thereafter, the FAA investigated and
    granted a no-hazard determination, approving the structure on the
    condition the farmer paint it and place blinking red lights on top, which
    he did. The FAA also adjusted the flight path. This did not satisfy the
    local commissioners, who two years later filed this action in equity to
    force the farmer to remove or modify the structure. The farmer raised an
    affirmative defense that the federal no-hazard determination preempted
    the local regulations.
    The district court, sitting in equity, rejected the preemption
    defense and issued an injunction requiring the farmer to remove or alter
    the grain leg at his expense and imposed a daily penalty after a nine-
    month grace period to abate the nuisance. The farmer appealed, and we
    transferred the case to the court of appeals, which affirmed the rejection
    of his preemption defense.      We granted the farmer’s application for
    further review.
    On our de novo review, we determine that the Federal Aviation Act
    allows for local zoning regulation, and the no-hazard letter did not
    preempt the local airport zoning regulations as a matter of law.      We
    affirm the district court’s finding the structure constitutes a threat to
    aviation requiring abatement.     But we conclude that the $200 daily
    3
    penalty should be vacated, and the nine-month period to modify or
    remove the structure shall begin anew when procedendo issues.         We
    affirm the district court judgment as modified.
    I. Background Facts and Proceedings.
    Loren and Pan Danner, husband and wife, live on a farm they own
    in Carroll County, Iowa. Loren has been farming this land since 1968.
    Loren formerly raised livestock but has exclusively grown row crops on
    the land since 2000. The Danner farm sits under the flight path to the
    Arthur N. Neu Municipal Airport, a facility managed by the Carroll
    Airport Commission (the Commission). Local zoning ordinances mandate
    a protected zone around the airport that extends 10,000 feet horizontally
    from the end of Runways 13 and 31 into an arc 150 feet above the
    airport. The Danners’ farm sits within this zone.
    In 2009, after a particularly good harvest, Loren realized he needed
    to find a way to more efficiently dry and store harvested grain.       He
    considered multiple options, but ultimately decided to construct a grain
    leg (also known as a bucket elevator) with attached storage bins. Loren
    and two farm neighbors built five grain-storage bins of varying sizes on
    the Danners’ farmland. The five bins stand in a semicircle around the
    grain leg. The grain leg is a 127-foot-tall structure with separate metal
    tubes sloping down from its top to each storage bin.
    The grain leg stands within 10,000 feet horizontally from the end of
    Runway 31. The top of the structure is 1413.43 feet above mean sea
    level. The protected airspace above the airport is 1354 feet above mean
    sea level. The structure reaches a height of 127 feet off the ground. The
    parties agree the grain leg intrudes within the airport’s protected
    airspace by approximately sixty feet.
    4
    In January 2013, before beginning construction of the grain leg,
    Loren went to Carl Wilburn, the county zoning administrator, to obtain a
    building permit.   Wilburn issued the building permit and granted the
    Danners an agricultural exemption from the county zoning ordinances.
    The agricultural exemption, however, did not exempt the Danners from
    the airport zoning ordinances.    The building permit application states,
    “All farm buildings or structures are subject to the Airport Zoning
    Ordinances which regulate[] height and emissions in and around the
    airport air space as depicted on the attached diagram[.]” The diagram
    attached to the permit showed the airport’s protected airspace. Despite
    this warning on the building permit application, neither the Danners nor
    Wilburn realized that the agricultural exemption did not exempt the
    grain leg from the airport zoning regulations.      For that reason, the
    Commission was never notified of the Danners’ application for a building
    permit, and the Danners failed to request a variance from the airport
    zoning ordinance. Construction of the grain leg began in April and was
    completed in August.
    Meanwhile, in June, Commissioner Greg Siemann noticed the
    grain leg construction and became concerned.          The next day, he
    contacted Wilburn and Greg Schreck, the city zoning commissioner.
    Wilburn informed Siemann that he had issued a building permit to the
    Danners with an agricultural exemption and acknowledged he was
    unaware of the local airport zoning restrictions.
    The Commission notified the Danners that the grain leg required a
    variance from the airport zoning regulations and informed the Danners it
    would not consent to the violation of the regulations or grant a variance.
    The Commission asked the FAA to perform an aeronautical study of the
    grain leg and its impact on aviation safety.
    5
    In July, after performing the aeronautical study, the FAA issued a
    “DETERMINATION OF NO HAZARD TO AIR NAVIGATION” letter, stating
    in part, “This aeronautical study revealed that the structure does exceed
    obstruction standards but would not be a hazard to air navigation” if the
    Danners met certain conditions.      The FAA instructed the Danners to
    paint the structure and add red lights to the top of it. The no-hazard
    letter warned the Danners,
    This determination concerns the effect of this structure on
    the safe and efficient use of navigable airspace by aircraft
    and does not relieve the sponsor of compliance
    responsibilities relating to any law, ordinance, or regulation
    of any Federal, State, or local government body.
    The Commission did not seek judicial review of the no-hazard
    determination as permitted under federal law. See 
    14 C.F.R. §§ 77.37
    ,
    .39, .41 (2013).   The Danners complied with the FAA’s instructions,
    adding lights and painting the grain leg. The FAA issued a “Notice to
    Airmen” (NOTAM) that raised the minimum descent levels for the airport
    by 100 feet, requiring pilots to approach the airport at a higher altitude.
    Two years later, in July 2015, the Commission filed this action on
    the district court’s equity docket alleging the grain leg violated certain
    building ordinances, city and county zoning ordinances, and airport
    commission regulations, and constituted a nuisance and hazard to air
    traffic. The Commission sought equitable relief—an injunction requiring
    the Danners to modify or remove the grain leg.       The Danners filed an
    answer and jury demand. The Danners raised an affirmative defense of
    federal preemption. The district court struck the jury demand because
    the case was filed in equity. The case proceeded to a bench trial.
    At trial, the following witnesses testified for the Commission:
    C. Peter Crawford, the engineer for the airport; John McLaughlin, a
    6
    meteorologist, pilot, and flight instructor; Donald Mensen, fixed base
    operator of the airport; Kevin Wittrock, a commissioner and a pilot; and
    Siemann, an attorney, pilot, and commissioner. Loren Danner testified
    on his own behalf. No pilot or aviation expert testified for the Danners.
    Crawford testified about the engineering survey of the grain leg in
    relation to Runway 31 of the airport. The survey showed that the grain
    leg was 7718 feet from the end of Runway 31 and within the airport’s
    protected zone.
    The other witnesses gave opinion testimony that the grain leg
    constituted a hazard to aviation.         The pilots testified about their
    experiences flying over the grain leg when landing at the airport and
    expressed their concerns for student pilots or pilots distracted while
    landing.   The Commission also presented testimony that the grain leg
    would jeopardize the airport’s ability to secure federal grant money. The
    record indicates, however, that the airport received two federal grants,
    one for $284,466 and another for $263,200, after the Danners installed
    the grain leg.
    Loren testified that it cost approximately $274,928 to construct the
    grain leg, $32,942 to install a concrete drive-over pad, and $8000 for an
    electrical contractor. Loren testified that if the height of the grain leg was
    reduced, he could no longer rely on gravity to move the grain from the
    distributor to the storage bins.       Instead, he would need to install
    conveyors. Loren estimated that the cost to tear down the grain leg and
    rebuild it with conveyors to each of the storage bins in compliance with
    the zoning regulations would be approximately $450,000.           These cost
    figures went unchallenged.
    In June 2017, the district court found that the grain leg violated
    state and local zoning ordinances and constituted a nuisance and an
    7
    airport hazard under Iowa Code sections 329.2 and 657.2(8) (2015). The
    court found that the grain leg did not fall within the agricultural
    exemption to certain zoning laws.        The court rejected the Danners’
    affirmative defense that the no-hazard letter preempted state and local
    zoning laws, stating,
    While the FAA regulations certainly do apply, the local
    county regulations can also be in effect.          The local
    regulations take a more stringent stance on what a hazard is
    and how it could affect the air space. If the FAA regulations
    contained all airport and safety regulations there would be
    no need for the State to designate zoning powers to the
    Commission. The Court finds that these regulations in fact
    work together and the FAA regulations and letter sent do not
    preempt the local regulations.
    The district court gave no evidentiary weight to the FAA’s aeronautical
    study and no-hazard determination.        The district court ordered the
    Danners to either remove the grain leg or modify its height to comply
    with the local regulations regarding the airport’s protected airspace. The
    Danners filed a motion for judgment notwithstanding the verdict and a
    motion for new trial in light of our ruling in State v. Martinez, 
    896 N.W.2d 737
     (Iowa 2017) (addressing preemptive effect of federal immigration
    laws). The district court denied the Danners’ motions.
    The Commission moved pursuant to Iowa Rule of Civil Procedure
    1.904(2) to enlarge the order to set a date certain for abatement and to
    impose a daily penalty after that date.     On September 5, the district
    court, after conferring with counsel, set May 1, 2018, as the date by
    which the Danners had to remove the grain leg or lower it by sixty feet,
    with a $200 per diem penalty every day thereafter accruing against the
    Danners jointly and severally.
    The Danners appealed.      We transferred the case to the court of
    appeals. The court of appeals affirmed, concluding that the doctrines of
    8
    express, implied, and conflict preemption did not apply to the FAA no-
    hazard determination.        The Danners filed an application for further
    review, which we granted.
    II. Standard of Review.
    The parties disagree as to the standard of review. The Commission
    contends the case was tried as a law action because the trial court ruled
    on objections.    The Danners contend the case was tried in equity.
    “Generally, our review of a decision by the district court following a
    bench trial depends upon the manner in which the case was tried to the
    court.” Collins Tr. v. Allamakee Cty. Bd. of Supervisors, 
    599 N.W.2d 460
    ,
    463 (Iowa 1999). If the case is tried at law, our review is for correction of
    errors at law. 
    Id.
     “Our review of cases tried in equity is de novo.” City of
    Eagle Grove v. Cahalan Invs., LLC, 
    904 N.W.2d 552
    , 558 (Iowa 2017).
    We conclude this case was tried in equity. The Commission filed
    the action in equity and sought only equitable relief—a permanent
    injunction. Notably, the district court struck the Danners’ jury demand
    based on its ruling that this is an action in equity.      Accordingly, our
    review is de novo.     
    Id.
       “Nevertheless, we give weight to the factual
    findings of the district court, especially with respect to determinations of
    witness credibility.” 
    Id.
    Preemption, however, is a question of federal law. See Martinez,
    896 N.W.2d at 746–47; Freeman v. Grain Processing Corp., 
    848 N.W.2d 58
    , 75 (Iowa 2014) (reviewing principles of federal preemption).        “We
    review the district court’s legal conclusions for correction of errors at
    law.” Walnut Creek Townhome Ass’n v. Depositors Ins., 
    913 N.W.2d 80
    ,
    87 (Iowa 2018).
    9
    III. Analysis.
    We must decide whether the FAA’s no-hazard determination for the
    Danners’ grain leg preempts state and local zoning ordinances limiting
    the height of structures in or near flight paths.           The Danners rely on
    Martinez, contending our recent acknowledgment of the supremacy and
    sweeping preemptive effect of federal immigration law in that case
    supports preemption under federal aviation law here.               In Martinez, we
    held federal immigration law preempted the state criminal prosecution of
    an undocumented worker for using false identity papers to gain
    employment. 896 N.W.2d at 757. 1 Federal immigration and aviation law
    alike can supersede conflicting local regulations.            At first glance, the
    Danners have more to argue in favor of preemption than Martha Aracely
    Martinez, who lacked a specific finding in her favor by federal authorities.
    By contrast, the FAA specifically investigated the Danners’ grain leg and
    issued a no-hazard determination (subject to conditions, which they
    satisfied).   Federal aviation law, however, allows room for local zoning
    regulation.    In our view, Martinez is not controlling here, and we will
    focus our analysis on aviation law and court decisions addressing the
    legal effect of FAA no-hazard determinations.
    We first address the Federal Aviation Act and the federal
    regulations promulgated to implement the Act’s safety standards.                  We
    next address Iowa state and local laws regulating structures near
    airports. We conclude federal law and the FAA no-hazard determination
    allow for local regulation of tall structures in flight paths, and the district
    court correctly rejected the Danner’s preemption defense.
    1The United States Supreme Court granted certiorari in another case addressing
    the preemptive effect of immigration law on state criminal prosecutions for identity
    theft. State v. Garcia, 
    401 P.3d 588
    , 599–600 (Kan. 2017), cert. granted in part, 
    139 S. Ct. 1317
     (2019).
    10
    A. Federal Law.
    1. The Federal Aviation Act.         The Federal Aviation Act of 1958,2
    codified as amended at 49 U.S.C. Subtit. VII, was created “for the
    purpose of centralizing in a single authority . . . the power to frame rules
    for the safe and efficient use of the nation’s airspace.”             Air Line Pilots
    Ass’n, Int’l v. Quesada, 
    276 F.2d 892
    , 894 (2d Cir. 1960). Pursuant to
    the Act, “[t]he United States Government has exclusive sovereignty of
    airspace of the United States.” 
    49 U.S.C. § 40103
    (a)(1) (2017).
    The Administrator of the Federal Aviation Administration
    shall develop plans and policy for the use of the navigable
    airspace and assign by regulation or order the use of the
    airspace necessary to ensure the safety of aircraft and the
    efficient use of airspace.
    
    Id.
     § 40103(b)(1).
    The Administrator “shall promote safe flight of civil aircraft in air
    commerce by prescribing . . . regulations and minimum standards for
    other practices, methods, and procedure the Administrator finds
    necessary for safety in air commerce and national security.”                        Id.
    § 44701(a)(5).     These safety standards apply to airports such as the
    Arthur N. Neu Municipal Airport. Id. § 44701(b). The Administrator is
    directed to carry out the safety regulation “chapter in a way that best
    tends to reduce or eliminate the possibility or recurrence of accidents in
    air transportation.” Id. § 44701(c).
    As one aspect of airport and aircraft safety, the Act regulates the
    construction of structures that interfere with airspace.               This includes
    prescribing notice requirements for individuals who seek to build or
    expand a structure. Id. § 44718(a). The Act provides for aeronautical
    2Both   the Federal Aviation Administration and the Federal Aviation Act are
    referred to as the FAA. In this opinion, we refer to the Federal Aviation Administration
    as the FAA and the Federal Aviation Act as the “Aviation Act” or “the Act.”
    11
    studies to determine the impact of the proposed construction.               Id.
    § 44718(b).      During    an   aeronautical    study,   the    Secretary   of
    Transportation must
    (A) consider factors relevant to the efficient and
    effective use of the navigable airspace, including—
    (i) the impact on arrival, departure, and en route
    procedures for aircraft operating under visual flight
    rules;
    (ii) the impact on arrival, departure, and en route
    procedures for aircraft operating under instrument
    flight rules;
    (iii) the impact on existing public-use airports and
    aeronautical facilities;
    (iv) the impact on planned public-use airports and
    aeronautical facilities;
    (v) the cumulative impact resulting from the proposed
    construction or alteration of a structure when combined
    with the impact of other existing or proposed
    structures; and
    (vi) other factors relevant to the efficient and effective
    use of navigable airspace[.]
    Id. § 44718(b)(1)(A)(i)–(vi).   To implement the Act’s requirements,
    Congress empowered the FAA to promulgate regulations. Id. § 40103(b).
    2. The federal regulations. Title 14, part 77 of the Code of Federal
    Regulations sets forth notice requirements for proposed construction,
    guidance on determining whether proposed construction or an existing
    structure is an obstruction to air navigation, the aeronautical study and
    hazard/no-hazard determination process, and the procedure for petitions
    for review of such determinations. 
    14 C.F.R. § 77.1
     (2018).
    The regulations state that obstructions are presumed to be airport
    hazards unless an aeronautical study determines otherwise.                  
    Id.
    § 77.15(b). The FAA uses the safety regulations, as well as FAA policy
    and guidance materials, to determine whether an obstruction is an
    12
    airport hazard.    Id.; see also id. § 77.25(c) (noting that obstruction
    standards may be supplemented by other guidance).
    The regulations provide certain height safety standards.            The
    surfaces used to determine height safety requirements include “an initial
    approach segment, a departure area, and a circling approach area,” as
    well as “[t]he surface of a takeoff and landing area” of an airport.       Id.
    § 77.17(a). The regulations also establish certain “imaginary surfaces” in
    relation to the runways of an airport, which create imaginary arcs within
    which an object may be an airport hazard. Id. § 77.19. The size of the
    imaginary surface depends upon the type of runway and the types of
    approaches a pilot can make on the runway. Id. The arcs are all 150
    feet above the airport elevation, and the radius is either 5000 or 10,000
    feet depending on the type of runway. Id. § 77.19(a).
    If the FAA conducts an aeronautical study to determine whether an
    object is an airport hazard, it will evaluate the following in addition to the
    factors set out in 
    42 U.S.C. § 44718
    (b)(1),
    (4) Airport traffic capacity of existing public use
    airports and public use airport development plans received
    before the issuance of the final determination;
    (5) Minimum obstacle clearance altitudes, minimum
    instrument flight rules altitudes, approved or planned
    instrument approach procedures, and departure procedures;
    (6) The potential effect on ATC radar, direction finders,
    ATC tower line-of-sight visibility, and physical or
    electromagnetic effects on air navigation, communication
    facilities, and other surveillance systems;
    (7) The aeronautical effects resulting from the
    cumulative impact of a proposed construction or alteration of
    a structure when combined with the effects of other existing
    or proposed structures.
    
    14 C.F.R. § 77.29
    (a); see also 
    id.
     § 77.25(b).
    After an aeronautical study, the FAA makes an initial hazard/no-
    hazard determination. Id. § 77.31. Pursuant to the regulations,
    13
    [a] Determination of No Hazard to Air Navigation will be
    issued when the aeronautical study concludes that the
    proposed construction or alteration will exceed an
    obstruction standard but would not have a substantial
    aeronautical impact to air navigation. A Determination of No
    Hazard to Air Navigation may include the following:
    (1) Conditional provisions of a determination.
    (2) Limitations necessary to minimize potential
    problems, such as the use of temporary construction
    equipment.
    (3) Supplemental notice requirements, when required.
    (4) Marking       and    lighting     recommendations,    as
    appropriate.
    Id. § 77.31(d). The no-hazard determination will expire eighteen months
    after its effective date. Id. § 77.33(b).
    The regulations provide a procedure to petition the FAA to
    reconsider or revise the determination, provided that construction has
    not begun and the petition is submitted at least fifteen days before the
    determination expires.     Id. § 77.35(a).     This determination will become
    final unless the FAA grants discretionary review.            Id. § 77.37, .39
    (discussing the procedure for discretionary review).           An individual
    seeking discretionary review must do so within thirty days of the date of
    the determination. Id. § 77.39(a).
    The no-hazard determination is reviewable as a final agency
    disposition. Aircraft Owners & Pilots Ass’n v. FAA, 
    600 F.2d 965
    , 966 n.2
    (D.C. Cir. 1979). FAA no-hazard determinations have been successfully
    challenged under federal judicial review. See, e.g., Town of Barnstable v.
    FAA, 
    659 F.3d 28
    , 35–36 (D.C. Cir. 2011) (vacating FAA no-hazard
    determination for off-shore wind farm); Clark County v. FAA, 
    522 F.3d 437
    , 443 (D.C. Cir. 2008) (vacating FAA no-hazard determination for
    wind farm near Las Vegas airport).
    14
    In Aircraft Owners & Pilots Ass’n, the United States Court of
    Appeals for the District of Columbia discussed the limited legal effect of a
    hazard/no-hazard determination:
    Once issued, a hazard/no-hazard determination has
    no enforceable legal effect. The FAA is not empowered to
    prohibit or limit proposed construction it deems dangerous
    to air navigation. Nevertheless, the ruling has substantial
    practical impact. The Federal Communications Commission,
    for example, considers the FAA’s classification in granting
    permits for the construction of broadcast towers. The ruling
    may also affect the ability of a sponsor proposing
    construction to acquire insurance or to secure financing.
    Primarily, however, the determination promotes air safety
    through “moral suasion” by encouraging the voluntary
    cooperation of sponsors of potentially hazardous structures.
    
    600 F.2d at
    966–67 (footnotes omitted) (citation omitted).
    “Nonetheless, a hazard determination can hinder the project
    sponsor in acquiring insurance, securing financing or obtaining approval
    from state or local authorities.” BFI Waste Sys. of N. Am., Inc. v. FAA,
    
    293 F.3d 527
    , 530 (D.C. Cir. 2002); see also White Indus., Inc. v. FAA,
    
    692 F.2d 532
    , 533 n.1 (8th Cir. 1982) (“Although the FAA determination
    has no enforceable legal effect, it does have substantial practical impact
    as the Federal Communications Commission considers the determination
    in making its decisions with respect to proposed construction.”).
    B. Iowa Law.     The State of Iowa and Carroll County each have
    enactments addressing airport hazards.       Any city or county with an
    airport may establish an airport commission to manage and control the
    airport.   
    Iowa Code § 330.17
    (1).    These commissions have “all of the
    powers in relation to airports granted to cities and counties under state
    law, except powers to sell the airport.”     
    Id.
     § 330.21.   These powers
    include the authority to make decisions with regard to zoning to prevent
    airport hazards. Id. §§ 329.2–.3. “In the event of any conflict between
    15
    any airport zoning regulations adopted or established under this chapter
    and any other regulations applicable to the same area, . . . the more
    stringent limitation or requirement shall govern and prevail.” Id. § 329.8.
    The Iowa Code defines an airport hazard as
    any structure or tree or use of land which would exceed the
    federal obstruction standards as contained in 
    14 C.F.R. § 77.21
    , 77.23 and 77.25 as revised March 4, 1972, and
    which obstruct the air space required for the flight of aircraft
    and landing or take-off at an airport or is otherwise
    hazardous to such landing or taking off of aircraft.
    
    Id.
     § 329.1(2).
    With regard to airport hazards, section 329.2 states,
    It is hereby found that an airport hazard endangers
    the lives and property of users of the airport and of
    occupants of land and other persons in its vicinity, and also,
    if of the obstruction type, in effect reduces the size of the
    area available for the landing, taking off and maneuvering of
    aircraft, thus tending to destroy or impair the utility of the
    airport and the public investment therein. Accordingly, it is
    hereby declared:
    1. That the creation or establishment of an airport
    hazard is a public nuisance and an injury to the community
    served by the airport in question.
    2. That it is necessary in the interest of public health,
    safety, and general welfare that the creation or
    establishment of airport hazards be prevented.
    3. That this should be accomplished, to the extent
    legally possible, by proper exercise of the police power.
    4. That   the    prevention  of  the   creation   or
    establishment of airport hazards, and the elimination,
    removal, alteration, mitigation, or marking and lighting of
    existing airport hazards are public purposes for which
    municipalities may raise and expend public funds, as an
    incident to the operation of airports, to acquire land or
    property interests therein.
    Id.
    If an airport hazard exists, the Commission “may maintain actions
    in    equity   to   restrain   and   abate   as   nuisances   the   creation   or
    16
    establishment of airport hazards appertaining to said airport, in violation
    of any zoning regulations adopted or established pursuant to the
    provisions of this chapter.”     Id. § 329.5; see also id. § 657.2(8) (“Any
    object or structure hereafter erected within one thousand feet of the
    limits of any municipal or regularly established airport or landing place,
    which may endanger or obstruct aerial navigation, including take-off and
    landing, unless such object or structure constitutes a proper use or
    enjoyment of the land on which the same is located.”).
    The Code provides a procedure for applying for a variance to zoning
    laws. Id. § 329.11. A variance
    shall be allowed where a literal application or enforcement of
    the regulations would result in practical difficulty or
    unnecessary hardship and the relief granted would not be
    contrary to the public interest, but would do substantial
    justice and be in accordance with the spirit of the
    regulations and this chapter; provided, however, that any
    such variance may be allowed subject to any reasonable
    conditions that the board of adjustment may deem necessary
    to effectuate the purposes of this chapter.
    Id.
    The Carroll County ordinances state with regard to placement of
    towers and antennas, “All tower height allowances outlined in the
    preceding sections are subject to approval from the municipal Airport
    Commission.”          Carroll   County,   Iowa,    Code   of   Ordinances
    § 14.15.040.02.7 (2017) (emphasis omitted); see also id. § 14.16.010.04
    (“All structures with a height greater than 30 feet shall be reviewed by
    the Carroll Airport Commission.”).     An applicant for a building permit
    must file an application with the county zoning administrator, including
    “[d]ocumentation that the proposed tower site and height have been
    approved by the appropriate Airport Commission.” Id. § 14.15.040.03.5
    (emphasis omitted).
    17
    The county board of adjustment, in compliance with Iowa Code
    section 355.12, is permitted to hear cases regarding “[v]ariances to
    zoning district requirements where there are unusual conditions or
    circumstances that cause a hardship when the provisions of zoning are
    strictly applied.” Id. § 14.18.010.07.3.
    The board shall reject any such application or appeal that is
    not filed within (10) days of the Zoning Administrator’s
    decision.    Also, the secretary shall reject any such
    application or appeal unless the same are made on
    prescribed forms properly filled out, with all required data
    attached.
    Id. § 14.18.010.08.4.
    The airport zoning regulations define an airport hazard as
    any structure or tree or use of land that would exceed the
    Federal obstruction standards as contained in 14 CFR
    77.21, 77.23, and 77.25, and that obstructs the airspace
    required for the flight of aircraft and landing or takeoff at an
    airport or is otherwise hazardous to such landing or taking
    off of aircraft.
    Id. § 171.01(3).
    The   county   airport   zoning    regulations   establish   “imaginary
    surfaces” as required by the federal regulations, creating a protected
    zone encompassing,
    1. Horizontal Zone. The land lying under a horizontal
    plane 150 feet above the established elevations, the
    perimeter of which is constructed by swinging arcs of 10,000
    feet radii from the center of each end of the primary surface
    of Runways 13 and 31, and 5,000 feet for Runways 3 and
    21, and connecting the adjacent arcs by lines tangent to
    those arcs. No structure shall exceed 150 feet above the
    established airport elevation in the horizontal zone, as
    depicted on the Arthur N. Neu Municipal Airport Height
    Zoning Map.
    Id. § 171.02(1).
    18
    The regulations also state,
    5. Increase in Elevation of Structures. No structure
    shall be erected in the County that raises the published
    minimum descent altitude for an instrument approach to
    any runway, nor shall any structure be erected that causes
    the minimum obstruction clearance altitude or minimum en
    route altitude to be increased on any Federal airway in the
    County.
    Id. § 171.02(5).
    A landowner may request a variance from these regulations by
    applying to the board of adjustment and submitting a copy of the
    application to the Commission.        Id. § 171.05.    The Commission is
    permitted to give its opinion on the aeronautical effects of a possible
    variance within fifteen days of receiving its copy of the application. Id.
    The airport regulations state, similar to the Iowa Code, that with
    regard to conflicting regulations the more stringent requirement prevails:
    Where there exists a conflict between any of the regulations
    or limitations prescribed in this chapter and any other
    regulations applicable to the same area, whether the conflict
    is with respect to height of structures, the use of land, or any
    other matter, the more stringent limitation or requirement
    shall govern and prevail.
    Id. § 171.10.
    C. Application of Preemption Principles.          The Danners argue
    that the FAA no-hazard determination for their grain leg preempts a
    contrary determination by the Commission. The Danners contend that
    allowing local airports to determine what constitutes an airport hazard
    would impermissibly alter the federal standards. The district court and
    court of appeals disagreed and determined that federal law allows for
    overlapping local regulation of hazards. We agree that local regulation of
    tall structures near flight paths is recognized under federal aviation law.
    19
    Under the Supremacy Clause of the United States Constitution,
    “the Laws of the United States . . . shall be the supreme Law of the Land
    . . . , any Thing in the . . . Laws of any State to the Contrary
    notwithstanding.” U.S. Const. art. VI, cl. 2.
    Consideration of issues arising under the Supremacy Clause
    “start[s] with the assumption that the historic police powers
    of the States [are] not to be superseded by . . . Federal Act
    unless that [is] the clear and manifest purpose of Congress.”
    Abdullah v. Am. Airlines, Inc., 
    181 F.3d 363
    , 366 (3d Cir. 1999)
    (alterations in original) (quoting Cipollone v. Liggett Grp., Inc., 
    505 U.S. 504
    , 516, 
    112 S. Ct. 2608
    , 2617 (1992)).
    [T]he Supremacy Clause has been interpreted to mean that
    even if a state statute is enacted in the execution of
    acknowledged state powers, state laws that “interfere with,
    or are contrary to the laws of Congress” must yield to federal
    law.
    Martinez, 896 N.W.2d at 746 (quoting Gibbons v. Ogden, 
    22 U.S. 1
    , 211,
    
    9 Wheat. 1
    , 82 (1824)). The Supremacy Clause is implemented through
    the preemption doctrine. 
    Id.
    We have recognized “[t]here is a presumption against preemption
    which counsels a narrow construction of preemption provisions.” Huck
    v. Wyeth, Inc., 
    850 N.W.2d 353
    , 363 (Iowa 2014) (alteration in original)
    (quoting Ackerman v. Am. Cyanamid Co., 
    586 N.W.2d 208
    , 213 (Iowa
    1998)); see also Freeman, 848 N.W.2d at 83 (discussing “cooperative
    federalism” under which the federal law sets a floor, not a ceiling, and
    states may impose more stringent protections).      That is what we have
    here under aviation laws regulating the height of structures in flight
    paths, as we explain below.
    There are two broad categories of preemption, express and implied.
    Martinez, 896 N.W.2d at 746. Within implied preemption there are two
    20
    subcategories, conflict preemption and field preemption.      Id.   We will
    address express preemption, conflict preemption, and field preemption in
    turn.
    1. Express preemption.   “Express preemption occurs when the
    federal statutory text clearly provides that congressional authority is
    exclusive.”   Id.   Express preemption requires examining the statutory
    language to determine the legislature’s intent. Id.
    Although the Aviation Act states that “[t]he United States
    Government has exclusive sovereignty of airspace of the United States,”
    
    49 U.S.C. § 40103
    (a)(1), there is no clear statutory text that Congress
    intended to make the FAA’s authority under the Aviation Act exclusive as
    to restrictions on structures near airports. We agree with the court of
    appeals that the Aviation Act does not expressly preempt the state
    statutes and local ordinances at issue here.
    2. Conflict preemption. “Conflict preemption occurs when a state
    law conflicts with a federal provision.”   Martinez, 896 N.W.2d at 747.
    “Conflict preemption occurs when ‘compliance with both federal and
    state regulation is a physical impossibility.’ ”   Id. (quoting Fla. Lime &
    Avocado Growers, Inc. v. Paul, 
    373 U.S. 132
    , 142–43, 
    83 S. Ct. 1210
    ,
    1217 (1963)).       “Conflict preemption also is imminent whenever two
    separate remedies are brought to bear on the same activity.”            
    Id.
    “Conflict preemption also occurs when a state law is an obstacle to the
    accomplishment of a federal purpose.” 
    Id.
     “What is a sufficient obstacle
    is a matter of judgment, to be informed by examining the federal statute
    as a whole and identifying its purpose and intended effects.” 
    Id.
     (quoting
    Crosby v. Nat’l Foreign Trade Council, 
    530 U.S. 363
    , 373, 
    120 S. Ct. 2288
    , 2294 (2000)).
    21
    The district court concluded that both the federal and local
    regulations could be in effect and regulate airport hazards without
    conflict. The district court concluded the Aviation Act did not preempt
    the local regulations stating,
    The local regulations take a more stringent stance on what a
    hazard is and how it could affect the air space. If the FAA
    regulations contained all airport and safety regulations there
    would be no need for the State to designate zoning powers to
    the Commission.
    The court of appeals determined the doctrine of conflict preemption did
    not apply because compliance with both statutes was not impossible.
    Because the state regulations impose a greater burden, it is possible to
    comply with both the state and federal regulations. This is supported,
    the court determined, by the statement in the no-hazard determination
    that “[t]his determination . . . does not relieve [the Danners] of
    compliance responsibilities relating to any law, ordinance, or regulation
    by any Federal, State, or local government body.”
    It is possible to comply with the federal, state, and local laws
    without conflict. We agree with the district court and court of appeals
    that the doctrine of conflict preemption does not apply in this case.
    3. Field preemption. “Field preemption arises when Congress has
    enacted a comprehensive scheme.”         Id. at 746.     In cases of field
    preemption,
    congressional intent to preempt can be inferred from a
    framework of regulation “so pervasive . . . that Congress left
    no room for the States to supplement it” or where there is a
    “federal interest . . . so dominant that the federal system will
    be assumed to preclude enforcement of state laws on the
    same subject.”
    Id. at 746–47 (quoting Rice v. Santa Fe Elevator Corp., 
    331 U.S. 218
    , 230,
    
    67 S. Ct. 1146
    , 1152 (1947)).
    22
    “[C]oncluding that Congress intended to occupy the field of air
    safety does not end our task.”            Goodspeed Airport LLC v. E. Haddam
    Inland Wetlands & Watercourses Comm’n, 
    634 F.3d 206
    , 210 (2d Cir.
    2011).     “The key question is thus at what point the state regulation
    sufficiently interferes with federal regulation that it should be deemed
    pre-empted[.]”     
    Id. at 211
     (alteration in original) (quoting Gade v. Nat’l
    Solid Wastes Mgmt. Ass’n, 
    505 U.S. 88
    , 107, 
    112 S. Ct. 2374
    , 2387
    (1992)).
    A variety of state and local laws have been preempted by the
    Aviation Act, including tort law, 3 state regulation of air travel, 4 and noise
    regulations. 5      However, in Goodspeed Airport, the environmental
    3See, e.g., Montalvo v. Spirit Airlines, 
    508 F.3d 464
    , 468 (9th Cir. 2007) (holding
    that the Aviation Act preempted state law duty-to-warn claims for passengers who
    developed deep vein thrombosis on domestic flights); Abdullah, 
    181 F.3d at
    371–72
    (holding that air safety standards as they relate to a standard of care for state
    negligence claims were preempted); In re Sept. 
    11 Litig., 811
     F. Supp. 2d 883, 891
    (S.D.N.Y. 2011) (finding that federal law preempted state law with regard to the
    standard of care applicable to the defendant’s conduct in allowing terrorists to hijack
    and crash a plane, noting that if state law controlled “air carriers then would be
    subjected to an untenable mixture of 50 different state legal regimes, and not to a
    uniform federal legal regime”); In re Air Crash Near Clarence Ctr., N.Y., on Feb. 12, 2009,
    
    798 F. Supp. 2d 481
    , 486 (W.D.N.Y. 2011) (finding that the FAA preempted state law
    negligence standard of care). But see Sikkelee v. Precision Airmotive Corp., 
    822 F.3d 680
    , 683 (3d Cir. 2016) (holding that the FAA did not preempt design defect claims).
    4See,  e.g., U.S. Airways, Inc. v. O’Donnell, 
    627 F.3d 1318
    , 1329 (10th Cir. 2010)
    (“Based on the pervasive federal regulations concerning flight attendant and crew
    member training and the aviation safety concerns involved when regulating an airline’s
    alcoholic beverage service, we conclude that [the state liquor law’s] application to an
    airline implicates the field of airline safety that Congress intended federal law to
    regulate exclusively. Thus, New Mexico’s regulatory efforts are impliedly preempted.”);
    Air Transp. Ass’n of Am., Inc. v. Cuomo, 
    520 F.3d 218
    , 219 (2d Cir. 2008) (per curiam)
    (finding that federal law preempted a state law establishing a passenger’s bill of rights);
    French v. Pan Am Express, Inc., 
    869 F.2d 1
    , 1 (1st Cir. 1989) (holding that pilot
    regulation statute was preempted).
    5See, e.g., City of Burbank v. Lockheed Air Terminal Inc., 
    411 U.S. 624
    , 638–40,
    
    93 S. Ct. 1854
    , 1862–63 (1973) (concluding that the Aviation Act preempted a city
    ordinance attempting to control noise by prohibiting aircraft from taking off between 11
    p.m. and 7 a.m.); Burbank-Glendale-Pasadena Airport Auth. v. City of Los Angeles, 
    979 F.2d 1338
    , 1341 (9th Cir. 1992) (finding that local regulations regarding airport noise
    were preempted).
    23
    regulation at issue—requiring a permit to cut down trees on wetlands—
    was not preempted because it did not sufficiently interfere with the
    federal regulations. Id. at 212. The court declined to determine
    whether the FAA Regulations would preempt the state and
    local laws, regulations, and actions challenged here if the
    trees were declared hazards and their removal ordered by the
    FAA. Significantly, in this case the federal government
    renounced any intention—indeed, questioned whether it had
    the authority—to declare the trees hazards and/or order
    their removal.
    Id. at 208 n.1.
    Courts have found ample room for state and local regulation. See,
    e.g., City of Cleveland v. City of Brook Park, 
    893 F. Supp. 742
    , 751 (N.D.
    Ohio 1995) (“While it is certainly true that runway placement will have
    some tangential effect on flight operations, the question of whether and
    where to construct a runway does not substantially affect the use of
    airspace. . . . The Federal Aviation Act does not occupy the field of land
    use regulations in such a way so as to preempt Brook Park’s
    ordinances.”).
    The court of appeals concluded the doctrine of field preemption did
    not apply because the Act only sets minimum standards and implies that
    another body may lawfully impose more stringent standards. The court
    also noted that the FAA did not intend for the no-hazard determination
    to supersede state and local law because it has no enforceable legal
    effect. We agree for the reasons explained below.
    4. Cases addressing the preemptive effect of FAA no-hazard
    determinations for tall structures in flight paths.   We now turn to the
    several   cases   specifically   adjudicating   whether   FAA   no-hazard
    determinations preempt local regulation of the height of structures in
    flight paths.
    24
    The Commission relies on Commonwealth v. Rogers, an appeal by a
    business owner found guilty of violating a state statute by erecting a
    ninety-five-foot-tall sign that encroached on an airport’s approach area,
    without seeking prior approval from the Pennsylvania Department of
    Transportation.        
    634 A.2d 245
    , 246–47 (Pa. Super. Ct. 1993).           The
    Rogers court, citing to Aircraft Owners & Pilots Ass’n, concluded that
    because FAA hazard/no-hazard determinations had no enforceable legal
    effect, the ability to prohibit or limit proposed construction because of
    the hazard it poses to air navigation “has been left to the states.” 
    Id. at 250
    .     The Rogers court concluded, “Thus, although Congress has
    concerned itself with the hazards posed by tall structures, it has left
    untouched the legal enforcement of standards, which are peculiarly
    adapted to local regulation.               Therefore, the states may legislate
    concerning such matters.” 
    Id.
     The court noted that “[b]y enacting [the
    state    statute],     the   legislature     empowered   [the   department    of
    transportation] to enforce mandatory compliance with FAA regulations
    which are designed to identify potential hazards to air navigation.” 
    Id. at 253
    .    “Unlike the determination made by the FAA, [the department of
    transportation’s] determination is enforceable, rather than advisory.” 
    Id.
    “In order to ensure that landowners will comply with the requirement of
    prior approval by [the department of transportation], the legislature has
    mandated that the failure to seek approval is a summary offense.” 
    Id.
    The court concluded this was a proper exercise of police power, and “[i]n
    this manner, [the department of transportation] can ensure that the
    safety regulations promulgated by the FAA are applied uniformly
    throughout the Commonwealth to establish a minimum threshold of
    safety, irrespective of different standards which may be adopted at the
    local level.”    
    Id.
         Rogers is distinguishable, however, because the
    25
    defendant had not actually received an FAA no-hazard determination as
    to the tall sign at issue.
    In La Salle National Bank v. Cook County, a developer sought to
    construct eight-story apartment buildings near a naval air base.       
    340 N.E.2d 79
    , 81–82 (Ill. App. Ct. 1975). The developer relied on “a letter it
    received from the FAA indicating the proposed construction did not
    violate the height restrictions imposed by FAA on buildings in military
    airport approach zones.” 
    Id. at 83
    . County zoning officials nevertheless
    denied a required zoning reclassification based on local zoning height
    restrictions and pilot testimony that the buildings would pose a hazard.
    
    Id. at 81
    , 83–84.       The appellate court, concluding that the local
    standards did not impede aviation, affirmed the rejection of the
    developer’s federal preemption claim. 
    Id.
     at 87–88. Similarly, here, the
    Commission’s pilot witnesses testified the grain leg posed a hazard to
    aviation.
    The Commission also relies on Aeronautics Commission of Indiana
    v. State ex rel. Emmis Broadcasting Corp., 
    440 N.E.2d 700
     (Ind. Ct. App.
    1982). There, business owners sought to purchase the assets of a radio
    station but wanted to move the broadcast tower.       
    Id.
     at 701–02.   The
    prospective purchaser was required to coordinate with the Federal
    Communications Commission, “vested with authority to regulate the
    proposed construction and maintenance of broadcast towers[,]” as well
    as the FAA, vested with the authority to determine “whether a proposed
    antenna presents a hazard to air navigation.” 
    Id.
     at 702 & n.2. The FAA
    performed an aeronautical study and determined the antenna and tower
    would not be a hazard to air navigation.       
    Id. at 702
    .   However, the
    aeronautics commission advised the purchaser that it must also obtain a
    permit pursuant to the Indiana High Structures Safety Act before
    26
    constructing the tower.    
    Id.
       The aeronautics commission denied the
    company’s application for a permit. 
    Id.
     The Indiana Court of Appeals,
    relying on Aircraft Owners & Pilots Ass’n, concluded that state and local
    regulations regarding tall structures were not preempted by the Aviation
    Act. 
    Id.
     at 704–06. The court determined that
    Congress has concerned itself with the potential hazards for
    air safety created by tall structures, but it has purposely left
    untouched a distinctive part of the subject—the legal
    enforcement of standards—peculiarly adapted to local
    regulation; thus the state may legislate concerning such
    local matters which Congress could have covered but did
    not.
    
    Id. at 706
    .
    On the other hand, a federal district court expressly declined to
    follow Aeronautics Commission of Indiana and, instead, held that the
    FAA’s no-hazard determination as to placement of a broadcast tower
    trumped a contrary local regulatory decision. Big Stone Broad., Inc. v.
    Lindbloom, 
    161 F. Supp. 2d 1009
    , 1021 (D.S.D. 2001).         There, a radio
    broadcaster sued members of the South Dakota Aeronautics Commission
    (SDAC) for injunctive and declaratory relief, challenging the SDAC’s
    denial of a permit to place an 875-foot broadcast tower near a state road
    used as a flight path for small aircraft. 
    Id.
     at 1011–13. The FAA had
    issued a no-hazard determination for the tower in that location. 
    Id.
     The
    Big Stone court noted the Indiana Court of Appeals “rooted its rationale”
    in the FAA’s lack of power to compel a state regulator to allow
    construction of a tower the state deemed hazardous to aviation
    “notwithstanding a[n] FAA determination to the contrary.” 
    Id.
     at 1020–
    21. The Big Stone court “craft[ed] a more limited remedy” by enjoining
    the SDAC
    from acting to prohibit the construction of proposed
    broadcast towers when the FAA, in adherence to its statutory
    27
    and regulatory provisions, determines that the proposed
    tower poses no hazard to air traffic and safety. In essence,
    then, the court enjoins [the SDAC] from vetoing a[n] FAA
    determination of “no hazard” in connection with radio
    broadcast towers.
    
    Id. at 1021
    . Big Stone has not been followed by other courts. It is also
    distinguishable.   Here, we are reviewing a judgment on a bench trial
    determining the grain leg is hazardous to aviation and violates local
    zoning requirements, rather than a district court ruling accommodating
    competing federal and state agency decisions. And, unlike Big Stone, the
    Commission was not really “vetoing” the FAA’s no-hazard determination
    because the no-hazard letter itself admonished the Danners that they
    remained subject to local zoning requirements.
    In Davidson County Broadcasting, Inc. v. Rowan County Board of
    Commissioners, the North Carolina Court of Appeals considered whether
    a county was preempted from regulating air safety. 
    649 S.E.2d 904
    , 907
    (N.C. Ct. App. 2007). In that case, a broadcasting company applied for a
    conditional use permit to construct a 1350-foot radio tower near a
    private airport. 
    Id.
     at 907–08. After a public hearing, the county board
    of commissioners denied the permit, finding that the tower would
    penetrate air traffic patterns at the private airport and would constitute
    “hazardous safety conditions” in violation of the county zoning code. 
    Id.
    The board reached this decision despite a no-hazard determination from
    the FAA.   
    Id.
       However, the board noted, “[T]he FAA’s review included
    only flight operations to and from public airports.   Miller Airpark is a
    private airport to which the FAA regulations do not apply.” 
    Id. at 908
    .
    The court found no conflict between the Act and the county zoning law.
    
    Id. at 911
    . The court based this conclusion on the language in the no-
    hazard letter stating that the no-hazard letter “does not relieve the
    sponsor of compliance responsibilities relating to any law, ordinance, or
    28
    regulation of any Federal, State, or local government body.”    
    Id.
       The
    same language is found in the FAA’s no-hazard letter for the Danners’
    grain leg.
    On balance, we decline to hold the FAA no-hazard determination
    preempted enforcement of local zoning requirements. We reiterate that
    “[t]here is a presumption against preemption.” Huck, 850 N.W.2d at 363
    (alteration in original) (quoting Ackerman, 
    586 N.W.2d at 213
    ). Federal
    courts recognize that the FAA’s “hazard/no-hazard determination has no
    enforceable legal effect” and “[t]he FAA is not empowered to prohibit or
    limit proposed construction it deems dangerous to air navigation.”
    Aircraft Owners & Pilots Ass’n, 
    600 F.2d at
    966–67. Accordingly, that
    role must fall to state and local government, indicating Congress left
    room for “cooperative federalism.” See Freeman, 848 N.W.2d at 83. In
    our view, the better reasoned authorities discussed above hold state and
    local regulators can impose stricter height restrictions on structures in
    flight paths notwithstanding an FAA no-hazard determination. Finally,
    we rely on the very language of this specific no-hazard determination,
    which expressly warned the Danners that they still must comply with
    state and local laws.
    D. Whether the District Court’s Injunctive Relief Should Be
    Affirmed.     On June 16, 2017, the district court sustained the
    Commission’s petition for abatement, finding the grain leg was an airport
    hazard constituting a nuisance. The district court ordered the grain leg
    to be removed or reconstructed at a lower height. The Danners filed a
    motion for judgment notwithstanding the verdict or for new trial, arguing
    federal preemption based on our holding in Martinez. The Commission
    filed a motion to set a date by which the grain leg had to be removed and
    29
    to impose a per diem penalty for each day after the deadline the grain leg
    continued to stand.
    The court rejected the Danners’ preemption defense based on
    Martinez and denied their motion for judgment notwithstanding the
    verdict. The court set a May 1, 2018 removal or modification deadline
    and, relying on Iowa Code section 329.14, imposed a $200 per day
    penalty commencing May 1, 2018, for each day the nuisance continued
    to stand unabated.      That penalty has continued to accrue during this
    appeal at an annual rate of $73,000. On our de novo review, we affirm
    the nuisance determination and remedy except that we vacate the
    per diem penalty as inequitable.
    “Permanent injunctive relief is an extraordinary remedy that is
    granted only when there is no other way to avoid irreparable harm to the
    plaintiff.”   Lewis Invs., Inc. v. City of Iowa City, 
    703 N.W.2d 180
    , 185
    (Iowa 2005).
    A plaintiff seeking permanent injunctive relief must establish
    “(1) an invasion or threatened invasion of a right; (2) that
    substantial injury or damages will result unless the request
    for an injunction is granted; and (3) that there is no
    adequate legal remedy available.”
    City of Okoboji v. Parks, 
    830 N.W.2d 300
    , 309 (Iowa 2013) (quoting Cmty.
    State Bank, Nat’l Ass’n v. Cmty. State Bank, 
    758 N.W.2d 520
    , 528 (Iowa
    2008)).
    The court must undertake “a comparative appraisal of all of the
    factors in the case,” and consider the following:
    (a) the character of the interest to be protected,
    (b) the relative adequacy to the plaintiff of injunction and of
    other remedies,
    (c) plaintiff’s delay in bringing suit,
    (d) plaintiff’s misconduct,
    30
    (e) the relative hardship likely to result to defendant if
    injunction is granted and to plaintiff if it is denied,
    (f) the interests of third persons and of the public, and
    (g) the practicability of framing and enforcing the order or
    judgment.
    Helmkamp v. Clark Ready Mix Co., 
    214 N.W.2d 126
    , 130 (Iowa 1974)
    (quoting Restatement (Second) of Torts, Tentative Draft No. 19, § 936(1)).
    “When determining whether an injunction is the proper remedy,
    the court must weigh the relative hardship to each party.”             In re
    Langholz, 
    887 N.W.2d 770
    , 779 (Iowa 2016).           Courts must structure
    permanent injunctions so that it will provide relief to the plaintiff without
    “interfer[ing] with the legitimate and proper actions of the person against
    whom it is granted.” 
    Id.
     at 779–80.
    “In equity cases, especially when considering the credibility of
    witnesses, [we] give[] weight to the fact findings of the district court, but
    [we are] not bound by them.”          Iowa R. App. P. 6.904(3)(g).       The
    Commission presented credible opinion testimony from experienced
    pilots familiar with the airport.          The district court credited their
    testimony that the grain leg poses a hazard to aviation there. So do we.
    The other runway would be risky to use in a strong crosswind common
    to that location.   The structure is not easy to see in certain weather
    conditions. The higher approach requires a steeper descent poorly suited
    to some types of aircraft. A distracted pilot might fly into the twelve-story
    elevator, with fatal consequences. We affirm the district court’s finding
    that the grain leg constitutes a nuisance and hazard to aviation. It is the
    $200 daily penalty accruing during this appeal that gives us pause.
    Iowa Code section 329.14 provides, “Each violation of [the airport
    zoning] chapter or of any regulations, order, or rules promulgated
    pursuant to this chapter, shall constitute a simple misdemeanor and
    31
    each day a violation continues to exist shall constitute a separate
    offense.” The statutory fine for a simple misdemeanor is “at least sixty-
    five dollars but not to exceed six hundred twenty-five dollars.”                    
    Id.
    § 903.1(a).
    Although the district court gave the Danners nine months to abate
    the nuisance before commencing the $200 daily penalty, the Danners’
    appeal was pending during that grace period. The district court did not
    find the Danners in contempt or in willful violation of the court’s
    abatement order. The Commission’s case against the Danners was no
    slam dunk. It is undisputed that the Danners fully complied with the
    FAA directive to paint the structure and place red lights on top. The FAA
    adjusted the flight path by 100 vertical feet to accommodate the grain
    leg. The FAA determined that these measures alleviated the danger to
    aviation posed by the structure. 6 The Commission failed to appeal the
    FAA no-hazard determination. Further, despite the trial testimony that
    the grain leg poses a hazard, the Commission waited nearly two years to
    file this action. The Danners presented uncontroverted testimony that
    the cost to remove the grain leg and rebuild it elsewhere is roughly
    $450,000 and that it would cost several hundred thousand dollars to
    modify the grain leg by reducing its height. We reject as speculative the
    testimony that the grain leg will impede efforts to obtain future grants
    from    the      same   federal   government       that   deemed      the   structure
    nonhazardous, especially since grants of $284,466 and $263,200 were
    awarded after the grain leg was built.           We factor these considerations
    into our equitable calibration of the postappeal deadline to bring down
    the grain leg.
    6Unlike  the district court, we give some evidentiary weight to the determination
    by federal aviation authorities that the grain leg is not a hazard to aviation.
    32
    The Danners presented a question of first impression in this
    jurisdiction as to whether the FAA’s aeronautical study and no-hazard
    determination preempted the Commission’s contrary determination that
    the grain leg is a hazard to aviation. While the district court, court of
    appeals, and now our court declined to give the FAA letter preemptive
    effect, this legal issue was not finally resolved until our opinion today.
    The caselaw in other jurisdictions is conflicting, and the Danners’
    position had some support.       See, e.g., Big Stone, 
    161 F. Supp. 2d at 1021
    . We find the Danners pursued this appeal to conclusion based on
    their good faith and objectively reasonable belief in their legal position.
    Although we now affirm the district court’s nuisance finding, this
    was a fair fight on the merits.      Enforcement of the per diem penalty
    under these circumstances would have a chilling effect on a litigant’s
    right to appeal a question of first impression in this jurisdiction.      The
    Danners exercised their right to appeal, which has now run its course.
    We affirm the injunction and hold abatement is required, but conclude it
    would be inequitable to impose the $200 daily penalty on the Danners
    from May 1, 2018, as originally ordered by the district court until they
    abate the nuisance. We elect to vacate the daily $200 penalty accruing
    during this appeal. Cf. 
    Iowa Code § 329.4
    (9) (suspending enforcement
    penalties   during     appeal    from     extraterritorial   airport   hazard
    determination); Palmer Coll. of Chiropractic v. Iowa Dist. Ct., 
    412 N.W.2d 617
    , 622 (Iowa 1987) (holding in contempt proceeding that failure to obey
    injunction constituted a single continuous violation and setting aside
    daily penalty); see also Ventres v. Goodspeed Airport, LLC, 
    881 A.2d 937
    ,
    968 (Conn. 2005) (affirming order suspending per diem penalties during
    pendency of action).
    33
    The district court, to its credit, allowed the Danners a nine-month
    grace period to abate the nuisance. See Palmer Coll. of Chiropractic, 
    412 N.W.2d at 622
     (commending the district court for allowing time to comply
    with its injunction).   We renew this nine-month period from the date
    procedendo issues.
    IV. Disposition.
    For the above-stated reasons, we vacate the decision of the court of
    appeals, vacate the $200 daily penalty, and affirm the district court
    judgment as modified to require the Danners to abate the nuisance
    within nine months from the effective date of our opinion.
    DECISION OF COURT OF APPEALS VACATED; DISTRICT
    COURT JUDGMENT AFFIRMED AS MODIFIED.
    All justices concur except McDonald, J., who takes no part.
    

Document Info

Docket Number: 17-1458

Citation Numbers: 927 N.W.2d 635

Judges: Waterman

Filed Date: 5/10/2019

Precedential Status: Precedential

Modified Date: 10/19/2024

Authorities (31)

In Re Air Crash Near Clarence Center, New York, on February ... , 798 F. Supp. 2d 481 ( 2011 )

Aeronautics Commission of Indiana v. State Ex Rel. Emmis ... , 1982 Ind. App. LEXIS 1427 ( 1982 )

Burbank-Glendale-Pasadena Airport Authority, a Joint Powers ... , 979 F.2d 1338 ( 1992 )

Clark County v. Federal Aviation Administration , 522 F.3d 437 ( 2008 )

Community State Bank v. Community State Bank , 2008 Iowa Sup. LEXIS 163 ( 2008 )

Ackerman v. American Cyanamid Co. , 1998 Iowa Sup. LEXIS 230 ( 1998 )

US Airways, Inc. v. O'DONNELL , 627 F.3d 1318 ( 2010 )

BFI Wst Sys N Amer v. FAA , 293 F.3d 527 ( 2002 )

khaled-abdullah-khitham-abdullah-v-american-airlines-inc-audrey-james , 181 F.3d 363 ( 1999 )

Helmkamp v. Clark Ready Mix Company , 214 N.W.2d 126 ( 1974 )

La Salle National Bank v. County of Cook , 34 Ill. App. 3d 264 ( 1975 )

white-industries-inc-v-federal-aviation-administration-and-southwest , 692 F.2d 532 ( 1982 )

Commonwealth v. Rogers , 430 Pa. Super. 253 ( 1993 )

Big Stone Broadcasting, Inc. v. Lindbloom , 2001 DSD 22 ( 2001 )

Town of Barnstable v. Federal Aviation Administration , 659 F.3d 28 ( 2011 )

Palmer College of Chiropractic v. Iowa District Court for ... , 1987 Iowa Sup. LEXIS 1286 ( 1987 )

Collins Trust v. Allamakee County Board of Supervisors , 1999 Iowa Sup. LEXIS 228 ( 1999 )

9-fair-emplpraccas-1027-1-empl-prac-dec-p-9663-air-line-pilots , 276 F.2d 892 ( 1960 )

Florida Lime & Avocado Growers, Inc. v. Paul , 83 S. Ct. 1210 ( 1963 )

City of Burbank v. Lockheed Air Terminal, Inc. , 93 S. Ct. 1854 ( 1973 )

View All Authorities »