620 ILCS 40/1

Every county has the power to locate, establish, acquire, own, construct, manage, maintain and operate, develop, expand, extend and improve airports, landing fields, or airport facilities within its boundaries or within or upon any land adjacent thereto, together with all land, appurtenances, and easements, necessary or useful in connection therewith. Such power includes every kind of structure.

No land may be used for the expansion of airport landing fields until it has been zoned for airport purposes by the county or municipality having the zoning power over such land, as the case may be.