620 ILCS 25/18

In the event of conflict between any airport zoning regulations adopted under this Act and any other regulations applicable to the same area, whether the conflict be with respect to the height of structures or trees, the use of land, or any other matter, and whether such other regulations were adopted by the political subdivision which adopted the airport zoning regulations or by some other political subdivision, or by the Department, the more stringent limitation or requirement shall govern and prevail.