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.

Flying training was performed with Fairchild PT-19s as the primary trainer with also several PT-17 Stearmans and a few P-40 Warhawks assigned.

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