Chicago Air was a regional airline carrier that operated in 1986 and exchanged passengers with all-jet Midway Airlines at Chicago Midway International Airport. The carrier operated revenue service from May to November, 1986 between Chicago and Madison, Green Bay, LaCrosse, Eau Claire, and Wausau, WI; Traverse City, MI; and, Peoria, Springfield and Quad Cities, IL. It operated six Fokker F27 turboprop aircraft, and the call sign was "Wild Onion" in reference to the Chippewa Indian derivation of the name "Chicago." The Fokker aircraft were subleased from Midstate Airlines of Stevens Point, Wisconsin, which also performed contract maintenance work on the aircraft at their Central Wisconsin Airport facility.