In 1935, Canada selected the Delta for use as a photographic survey aircraft for use by the Royal Canadian Air Force (RCAF), to be built by Canadian Vickers under license.
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When Jack Northrop set up the Northrop Corporation as a joint venture with the Douglas Aircraft Company in 1932, he set out to design two closely related single-engined aircraft as the new company's first products, a mailplane/record breaking aircraft, which was designated the Gamma and a passenger transport, the Delta.
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LAPE was one of the few airlines that used the Douglas DC-1; some of the other planes used by LAPE are the following: Fokker F.VII, Spartan Executive, Caudron C.448, Breguet 470, Savoia-Marchetti S.74, Northrop Delta, Douglas DC-2, Ford Trimotor, General Aviation GA-43, Airspeed AS.6J Envoy and De Havilland Dragon Rapide.
In December 1932, it ordered the XF7B from Boeing, and based on the impressive performance of Northrop's Gamma and Delta, both stressed skin monoplanes, placed an order with Northrop on May 8, 1933 for a single prototype fighter, designated XFT-1.