Keystone Aircraft
| The first Keystone B-3A bomber built, serial number 30-281 | |
| Industry | Aerospace | 
|---|---|
| Predecessor | Huff-Daland Aero Corporation | 
| Defunct | 1929 | 
| Fate | Merged into Curtiss-Wright in 1929 | 
| Successor | Curtiss-Wright | 
| Headquarters | |
| Key people | James McDonnell | 
Keystone Aircraft Corporation was an early American airplane manufacturer.