[1] Based in St.Louis, pilot, salesman and entrepreneur Oliver Parks founded an air school, airline and aircraft manufacturing business shortly after Lindbergh's 1927 transatlantic flight.

Production ended at number 45, before the onset of the Great Depression and the temporary takeover of the company by the Detroit Aircraft Corporation.

[4] While part of the Detroit Aircraft Corporation, one experimental P-1 (X289W) was modified with a faired in, tail mounted, all-plane parachute.

One P-1 has been restored and displayed at the EAA airshow at Oshkosh, Wisconsin winning the award for outstanding open cockpit aircraft in 1992.

[5] Data from Specifications of American Commercial Airplanes[7]General characteristics Performance (Partial listing, only covers most numerous types)