620 ILCS 25/21
All airport zoning regulations adopted under this Act shall be reasonable and none shall impose any requirement or restriction which is not reasonably necessary to effectuate the purposes of this Act. In determining what regulations it may adopt, the Department, and each political subdivision and joint airport zoning board shall consider, among other things, the character of the flying operations expected to be conducted at the airport, the traffic pattern and regulations affecting flying operations at the airport, the nature of the terrain within the airport hazard area, the character of the neighborhood, and the uses to which the property to be zoned is put and adaptable; provided, however, that no airport zoning regulation shall be adopted limiting the height or location of structures usually and customarily employed in connection with public utility operations without the concurrence of the Illinois Commerce Commission.
620 ILCS 25/21