Douglas BT-2

The label 'Douglas BT 3A' appears to be an error: no Douglas BT-3 aircraft existed. The U.S. Army Air Corps' Basic Trainer (BT) category was introduced in 1930, and Douglas built only the BT-1, a basic-trainer conversion of the Douglas O-2 observation biplane, and the BT-2. The BT-3 designation in this series went not to Douglas but to the Stearman BT-3 'Cloudboy.' The most plausible intended subject is the Douglas BT-2, the principal Air Corps basic trainer of the early 1930s: a two-seat radial-engine biplane used to bridge primary and advanced flight training.

Specifications below are for the Douglas BT-2; the identification should be treated as uncertain given the apparent labeling error in the source data.