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Convair aircraft
Convair was the American planemaker, later part of General Dynamics, that built the Convair 340 and 440, twin-engine airliners with Pratt and Whitney Double Wasp piston engines, and military versions for the US forces, the C-131 family. The Model 340 was approved in March 1952 and the 440 in January 1956. Many were later rebuilt with turboprop engines: the Convair 580 has two Allison 501 turboprops under a supplemental type certificate now held by Kelowna Flightcraft of British Columbia, which also holds the 340 and 440 data sheet. This site lists the Convair 580, a turboprop conversion still seen in US airspace.