Mich. Comp. Laws § 259.444
In each case where (a) an airport is owned, operated, controlled, leased to, or leased by a political subdivision and an airport hazard area appertaining to the airport is located wholly or partly outside the territorial limits or jurisdiction of the political subdivision, or (b) an airport hazard area is located wholly or partly within the territorial limits or jurisdiction of 2 or more political subdivisions, whether or not the particular airport in connection with which the airport hazard area exists is owned, operated, controlled, leased to, or leased by 1 or more of the political subdivisions, all the political subdivisions involved, including the political subdivision which is the owner, operator, controller, lessee, or lessor of the airport, shall, by ordinance or by resolution duly adopted, create a joint airport zoning board, which board shall have the same power to adopt, administer, and enforce airport zoning regulations applicable to the airport hazard area in question, as that vested by section 13 in the political subdivision or political subdivisions within which the hazard area is wholly or partly located. Each joint board shall have as members 2 representatives appointed by the governing body of each political subdivision participating in its creation and in addition, another member to be elected by a majority of the members so appointed. This section shall not require the creation of a joint airport zoning board whenever a county, acting through its governing body or any county agency which is by law authorized to maintain, operate, and improve airports, adopts airport zoning regulations applicable to an airport hazard area located entirely within the territorial limits or jurisdiction of the county and the airport zoning regulations shall supersede any other airport zoning regulations applicable to the same airport zoning area.
MCL 259.444