620 ILCS 30/1

The safety, health, welfare and protection of persons and property in the air and on the ground and of the maintenance of electronic communications within this State require that the navigable airspace overlying the State and the approaches to and the air traffic pattern area of any public airport in this State be maintained in a reasonably unobstructed condition for the safe flight of aircraft. To that end, the location, height and identification of structures and the use of land thereto related are regulated.