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01/31/2008. This primary trainer was designed by North American and one prototype, designated NA-35 was built, registered as NX14299 it was flown in late 1939. It lost out to the Ryan STA-1 in a competition for an USAAF trainer, and subsequently the rights for the NA-35 were sold to Lockheed for production by its subsidiary Vega as the Model 35. Vega produced four aircraft: two models 35-67 (NX21760, NX28351), powered by an 125 hp Menasco Pirate D4 four-cylinder inverted in-line air-cooled engine, and two models 35-70 (NX28352, NX28353) powered by an 160 hp Super Pirate D4B. NX21760 was first flown by Bud Martin in January 1941 and although the Approved Type Certificate was obtained in February 1941, Vega by that time became involved in wartime production and the project was cancelled.