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The Lockheed Model 8 Sirius was a single engine, propeller-driven monoplane designed and built by Jack Northrop and Gerard Vultee while they were engineers at Lockheed in 1929, at the request of Charles Lindbergh.
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.
Jack Northrop (John Knudsen Northrop) (1895–1981), American aircraft industrialist and designer who founded the Northrop Corporation