305.505.  Definitions. — As used in sections 305.500 to 305.585, unless the context requires otherwise, the following words and terms mean:

  (1)  "Airport", an area of land or water, the boundaries of which shall be as designated by the authority for future airports, and as existing for present airports, which is intended for the landing and takeoff of aircraft, which provides facilities for the shelter, supply or care of aircraft, or for receiving or discharging passengers or cargo, and all appurtenant areas used or suitable for airport buildings or other related facilities, and all appurtenant rights-of-way, whether heretofore or hereafter established, or for any purpose reasonably incident to any of the foregoing;

  (2)  "Airport hazard", any structure, tree, or use of land which obstructs the airspace required for, or is otherwise hazardous to, or interferes with the flight of, aircraft in landing or taking off at the airport;

  (3)  "Authority", The Missouri-St. Louis metropolitan airport authority;

  (4)  "Authority airport", any airport or airports acquired, constructed, reconstructed, expanded, improved or leased by the authority and within the Missouri-St. Louis metropolitan area;

  (5)  "Governor", the governor of the state of Missouri;

  (6)  "Greater St. Louis metropolitan area", The Missouri-St. Louis metropolitan area and the counties of Madison, Monroe and St. Clair in the state of Illinois;

  (7)  "Instrument airport", an airport which has one or more runways equipped or to be equipped with precision electronic navigation aids or landing aids or other air navigation facilities suitable to permit the landing of aircraft by an instrumental approach under restricted visibility conditions by instrument flight rules;

  (8)  "Major airport", an airport serving air passengers, air cargo, and air freight by accommodating certified scheduled air carriers;

  (9)  "Missouri-St. Louis metropolitan area", the city of St. Louis and the counties of St. Louis, St. Charles, Franklin and Jefferson in the state of Missouri;

  (10)  "Noninstrument airport", an airport, other than an instrument airport, with no precision navigation or landing aids and suitable to permit the landing of aircraft by visual flight rules;

  (11)  "Person", any individual, partnership, firm, company, corporation, association, trust or estate or his or its legal representative or agent;

  (12)  "Related facilities", any buildings, structures, or other facilities necessary or appropriate for the control and safe operation of aircraft, the sheltering, servicing, or repair of aircraft, the receiving, discharging, sheltering, feeding, and supplemental transportation of passengers, the parking of motor vehicles, and the receipt, transfer, storage and discharge of cargo, or for any purpose reasonably incident thereto, and together with such residential, commercial, and industrial buildings, structures and facilities and public parks, recreation areas and conservation areas as shall be compatible with the operation of the authority airport and which may produce incidental income available for the expenses of any authority airport or public benefit, located or to be located on an authority airport and any aids to navigation necessary for the operation of any authority airport wherever located, and any land on which any aids are located;

  (13)  "Structure", an object constructed or installed by man, including, but not limited to, buildings, towers, smokestacks, light towers, and overhead transmission lines; and

  (14)  "Tree", any object of natural growth.