70 ILCS 5/14
An Airport Authority may apply for and receive the grant or loan of money or other financial aid from the state or federal government or from any state or federal agency, department, bureau or board, necessary or useful for the undertaking, performance or execution of any of its corporate objects or purposes, and any such Authority may undertake the acquisition, establishment, construction, development, expansion, extension or improvement of a public airport or public airports within or without its corporate limits or within or upon any body of water adjacent thereto and airport facilities incidental or appurtenant thereto, aided by, in cooperation with or as a joint enterprise with the state or federal governments or with the aid of, or in cooperation with, or as a joint project with both the state and federal governments. The state and federal governments in so acting may be represented by any authorized state or federal agency, department, bureau or board. An airport authority may participate, by adoption of an appropriate ordinance or resolution, in a public building commission and in a regional planning commission for territory which includes all or any part of the authority, and out of its corporate revenues may make contributions to pay the expenses of any such commission in which it participates.
70 ILCS 5/14