| XB-21 | |
|---|---|
 | |
| General information | |
| Type | Medium bomber |
| National origin | United States |
| Manufacturer | North American Aviation |
| Primary user | United States Army Air Corps |
| Number built | 1 |
| History | |
| First flight | 22 December 1936 |
| Developed into | North American NA-40 |
The North American XB-21 (manufacturer's model designation NA-21)[1] and sometimes referred to by the name "Dragon",[2] was a prototype bomber aircraft developed by North American Aviation in the late 1930s, for evaluation by the United States Army Air Corps. Evaluated against the Douglas B-18 Bolo, it was found to be considerably more expensive than the rival aircraft, and despite the ordering of a small number of evaluation aircraft, only the prototype was ever built.