| YB-9 | |
|---|---|
 | |
| General information | |
| Type | Bomber aircraft |
| Manufacturer | Boeing |
| Status | No surviving examples |
| Primary user | United States Army Air Corps |
| Number built | 7 |
| History | |
| Manufactured | 1930–1933 |
| Introduction date | 5 November 1931 |
| First flight | 13 April 1931 |
| Retired | 1935 |
The Boeing YB-9 was the first all-metal monoplane bomber aircraft designed for the United States Army Air Corps. The YB-9 was a much enlarged twin-engine development of Boeing's single-engine Model 200 Monomail commercial transport.