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North American NA-16 / NA-18 / BT-9 / NJ-1 / BT-16 / NA-64 / Yale 
When the modifications were complete, the Air Corps ordered 42 under the company design number NA-18; the Air Corps called it the BT-9 (basic trainer, type 9). The first production model was flown on April 15, 1936.
The Navy ordered 40 (0910-0949) of them after the existing engine was replaced with a 600hp P&W R-1340 version. That 1937 model was designated the NJ-1 (NA-28, N for trainer and J for North American).The last one was temporarily powered with a 1000hp Ranger XV-770 as NJ-2.
 North American NJ-1 0947
The 40 BT-9As that followed introduced a fixed forward gun (with gun camera) and a trainable gun in the rear cockpit. Only small changes were made in the 117 BT-9Bs and 67 BT-9Ds. The Australian Commonwealth Aircraft Corporation was formed in 1936 by several of the largest industrial concerns in Australia. To gain manufacturing experience, it had been decided to acquire a licence to produce an aircraft suitable for advanced training and as a replacement for RAAF Hawker Demons. An Australian Air Board Technical Commission visited the USA and evaluated the North American NA-16, ordered into production for the USAAC as the BT-9 (NA-19) basic trainer.
At the time of the Australian Commission’s visit, North American was working on a development of the BT-99 with a 600 hp Pratt & Whitney R-1340, retractable undercarriage and armament provision as a basic combat trainer. Designated NA-26, this aircraft fulfilled the Australian requirements, although there was disagreement over the need for retractable undercarriage.
As a result, two versions of the A-26 were offered to the Australians, the NA-32 (NA-16-1A) with fixed undercarriage, and the NA-33 (NA-16-2K) with a retractable undercarriage, and in 1937, negotiations for manufacturing rights in both the NA-32 and NA-33 were completed, and an order placed for one of each.
 NA-32 / NA-16-1A
The NA-32 was completed in July 1937, although it was not taken on charge by the RAAF until 8 November 1938, and by that time, the NA-33 / NA-16-2K, which had been completed in September 1937 and taken on charge by the RAAF on 2 February 1938, had already been selected for Australian production.
 NA-33 / NA16-2K
The NA-16-2K was with a few subtle changes in design to suit it more closely to RAAF requirements and Australian operating conditions, these including a reinforced sub-structure consistent with the rigors of the bombing role and improved offensive/defensive capabilities by the inclusion of 2 x 7.7mm machine guns as opposed to the NA-16's sole gun.
With the changes, the NA-33 was ordered into production for the RAAF as the A20, the Commonwealth Aircraft Corporation applying the designation CA-1 to the type, and the name Wirraway being adopted. Production of the initial aircraft was handled out of the Commonwealth Aircraft Corporation (CAC) facility at Fisherman's Bend in Melbourne, Victoria in 1938.
In 1938, Noorduyn acquired the manufacturing rights to the BT-9.
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