Aircraft Mock-Ups

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Was the NA-50B the aircraft proposed by NAA to the British Purchasing Commission, the NA-73 being the production design?
Yes. The first single seat fighter for NAA was the NA-50 for Peru. Second was the NA-50A for Siam, which became the NA-68/P-64 when the USAAF took them over. The next design in chronological order was the NA-50B, which became the NA-73/P-51 Mustang. The NAA designation system has always been a source of confusion with the charge numbers and customer numbers being quite different in many cases.
 

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