In 1922 T. Claude Ryan, an ex-Army reserve pilot, opened up a flying service and school in downtown San Diego. The flying school was one of the first government approved flight schools, allowing him to train commercial students as well as flying cadets for the Army Air Corps. In a joint effort with one of his flying students, B.F. Mahoney, Ryan created an airline service between San Diego and Los Angeles.
The Ryan Model ST-3KR, U.S. Army Air Corps PT-22 Recruit, evolved out of the design of the popular Ryan ST or Sport Trainer. It incorporated refinements that resulted in a rugged and easy to maintain military trainer. The Recruit was a wire-braced, low-winged monoplane, with open cockpit seating for two in tandem.
The Ryan ST family of aircraft (including the ST, STA, STB, STM, STK and STW) were some of the most popular and successful lines of civilian sport airplanes in history. First introduced by the San Diego company in 1934, the original ST (sport trainer) design was a two seat, open cockpit monocoque fuselage aircraft fitted with a 95-hp Menasco B4 inverted inline engine. Only five were built before Ryan introduced its peppier successor, the STA.
The Sopwith Pup was a British single seat biplane fighter aircraft built by the Sopwith Aviation Company, entering service with the Royal Flying Corps and the Royal Naval Air Service in the autumn of 1916. The armament on the Sopwith Pup is a 303 Vickers machine gun, fired forward through the arc of the propeller by means of a gun synchronizer. With pleasant flying characteristics and good maneuverability, the aircraft proved very successful.
A sturdy, compact biplane armed with a synchronized machine gun and a V-8 engine, the airplane debuted in 1916 and after overcoming several teething problems was a success with both French and British Air forces, with the British building them under license.