620 ILCS 25/16
Every airport zoning regulation for an airport hazard area existing in connection with a publicly-owned airport shall be designed to effectuate the Department's airport approach plan, as amended by it, whenever necessary, for such publicly-owned airport. Upon complaint filed with the Department, including a complaint upon the Department's own motion, and after notice and opportunity to be heard, in the manner provided by "An Act relating to aeronautics and repealing a certain act herein named", enacted by the 64th General Assembly, if the Department determines that any such airport zoning regulation, in whole or in part, is substantially inconsistent with the airport approach plan of the Department, as amended by it, whenever necessary, it shall declare such airport zoning regulation to be void, in whole or as to any separable part thereof, as may be appropriate, and the whole or such separable part of such airport zoning regulation as was declared by the Department to be void shall thereafter be deemed to be void.
620 ILCS 25/16