620 ILCS 5/27
The Department shall cooperate with and assist the Federal Government, the political subdivisions of this State, and other states, and others, including private persons, engaged in aeronautics or the promotion of aeronautics, and shall seek to coordinate the aeronautical activities of these bodies and persons. To this end, the Department is empowered to confer with or to hold joint hearings with any federal aeronautical agency, and the municipalities and other political subdivisions of this State and other states, in connection with any matter relating to aeronautics, and to avail itself of the cooperation, services, records, and facilities of such agencies, municipalities, and other political subdivisions, federal or otherwise, as fully as may be practicable, in the administration and enforcement of the laws of this State pertaining to aeronautics. The Department shall reciprocate by furnishing to such agencies, municipalities and other political subdivisions, federal or otherwise, its cooperation, services, records and facilities, in so far as may be practicable.
620 ILCS 5/27