The North American BT-9 was the United States Army Air Corps (USAAC) designation for a low-wing single engine monoplane primary trainer aircraft that served before and during World War II.

During the war, it was discovered that increasing the number of hours of Primary Flying Training eliminated the need for intermediate trainers like the BT-9 and so production never reached the levels for the PT and AT types.

The new fuselage would provide the basis for the entire AT-6 family, when fitted with the larger Pratt & Whitney R-1340 engine, a new wing with retractable undercarriage and minor changes for a gunners position.

However these did not work well, and the BT-14s longer fuselage and swept forward outer wing panels, unlike the straight trailing edges of the BT-9 helped somewhat.

The NA-26, an improved model with retractable landing gear which became the prototype for AT-6 Texan advanced trainer, was developed from the NA-16 design.