St. Louis Downtown Airport (IATA: CPS, ICAO: KCPS, FAA LID: CPS) is a public-use airport located in Greater St. Louis, one mile (2 km) east of the central business district of Cahokia Heights (formerly Cahokia), in St. Clair County, Illinois, United States.

[1][2] Historic Hangar #2 houses the Greater Saint Louis Air & Space Museum.

Taken over by the United States Army Air Forces on 1 August 1939 as a basic (level 1) pilot training airfield.

The military airfield was inactivated 12 March 1944 with the drawdown of AAFTC's pilot training program.

This article incorporates public domain material from the Air Force Historical Research Agency