Mich. Comp. Laws § 259.432
The term "airport", when used in this act means any location which is used for the landing or taking off 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 acquired for airport buildings or other airport facilities, and all appurtenant rights-of-way, either heretofore or hereafter established. An airport is "publicly owned" if the portion thereof used for the landing and taking off of aircraft is owned, operated, controlled, leased to or leased by the United States, any agency or department thereof, this state or any municipality or other political subdivision of this state, or any other governing body, public agency or other public corporation.
MCL 259.432