The six AAF P-64s (S/N 41-19082 to 41-18087) were originally North American NA-50A fighters built for the Siamese government after a contract was signed on Dec. 30, 1939. The NA-50A was a modification of the earlier NA-50 (seven ordered by Peru). The NA-50 series was essentially a single-place fighter version of the two-place North American NA-16 trainer.
The NA-50As were awaiting shipment in December 1941 when they were confiscated by the AAF because of the fall of Siam to the Japanese. The Army Air Corps redesignated the aircraft P-64 and used them as trainer and liaison aircraft.
Impounded Siamese NA-50A; renamed P-64
TECHNICAL NOTES: Armament: Two .30-cal. machine guns and two 20mm cannon Engine: Pratt & Whitney R-1820-77 of 875 hp Maximum speed: 270 mph Cruising speed: 235 mph Range: 900 mi. Span: 37 ft. 3 in. Length: 27 ft. 0 in. Height: 9 ft. 0 in. Weight: 6,990 lbs. maximum Crew: One