Illinois Statutes Chapter 70. Special Districts § 5/8.10. Regulation of aircraft

(a) For the prevention of accidents, for the furtherance and protection of public health, safety and convenience in respect to aeronautics, for the protection of property and persons within the authority from any hazard or nuisance resulting from the flight of aircraft, for the prevention of interference between, or collision of, aircraft while in flight or upon the ground, for the prevention or abatement of nuisances in the air or upon the ground or for the extension or increase in the usefulness or safety of any public airport or public airport facility owned by the airport authority, an authority may regulate the movement of aircraft upon the surface of any public airport or in the air above the incorporated territory of the authority.

(b) Aircraft with a maximum gross take-off weight in excess of 91,000 pounds may not use any airport facilities under the jurisdiction of a Metropolitan Airport Authority located in any county with a population of more than 700,000 and less than 1,100,000 except in an emergency or in connection with an air show or exhibition or as required by the Federal Aviation Administration or to otherwise comply with federal law.