620 ILCS 25/20
Prior to the adoption of any initial airport zoning regulations under this Act, except when such zoning is prescribed by the Department, under Section 17, the governing body of the political subdivision or the joint airport zoning board which is empowered to adopt such airport zoning regulations shall appoint a commission of 2 or more persons to be known as the airport zoning commission, to consider and recommend the airport zoning regulations proposed for initial adoption. Such commission shall make a preliminary report and hold one or more public hearings as it may find necessary thereon before submitting its final report, and the governing body of the political subdivision or the joint airport zoning board shall not adopt an ordinance or resolution making or providing initial airport zoning regulations or take other action in respect thereto until it has received the final report of such commission. Upon receipt of such final report said governing body or joint airport zoning board may without further public hearing adopt an ordinance or resolution providing for and making the initial airport zoning regulations recommended by such final report. In the event said governing body or board does not concur in the recommendations of such final report, it may conduct further public hearings thereon and upon any proposed amendment or change in the regulations thereby recommended, and, after said public hearing may reject such report or adopt an ordinance or resolution placing into effect the regulations as recommended by said commission or as amended or changed by said governing body or board after such public hearing. Where a city plan commission or comprehensive zoning commission already exists, it may be appointed as the initial airport zoning commission. Said ordinance or resolution may be amended, changed or revised after adoption by such governing body or board after it shall have conducted a public hearing upon any proposed amendment, change or revision. Public notice shall be given of all public hearings referred to in this section as is provided in the case of public hearings under Section 19.
620 ILCS 25/20