620 ILCS 25/14
In each case where (a) an airport is owned, operated, controlled, leased to or leased by a political subdivision and any airport hazard area appertaining to such airport is located wholly or partly outside the territorial limits of said political subdivision, or (b) an airport hazard area is located wholly or partly within the territorial limits of two or more political subdivisions, whether or not the particular airport in connection with which such airport hazard area exists is owned, operated, controlled, leased to or leased by one or more of such political subdivisions, all the political subdivisions involved, including the political subdivision which is the owner, operator, controller, lessee or lessor of such airport, may, by ordinance or 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 such area is wholly or partly located. Each such joint board shall have as members two representatives appointed by the governing body of each political subdivision participating in its creation and in addition, another member to be chairman, elected by a majority of the members so appointed.
620 ILCS 25/14