| I-15 and I-15bis | |
|---|---|
 I-15bis | |
| General information | |
| Type | Fighter |
| Manufacturer | Polikarpov |
| Designer | |
| Status | retired |
| Primary users | Soviet Air Force |
| Number built | 3,313 (plus 3,437 I-153)[1] |
| History | |
| Manufactured | 1934–1937[1] |
| Introduction date | 1934 |
| First flight | October 1933 |
| Developed from | Polikarpov I-5 |
| Variants | Polikarpov I-153 |
The Polikarpov I-15 (Russian: И-15) was a Soviet biplane fighter aircraft of the 1930s. Nicknamed Chaika (Russian: Чайка, "Seagull") because of its gulled upper wings,[2][3] it was operated in large numbers by the Soviet Air Force, and together with the Polikarpov I-16 monoplane, was one of the standard fighters of the Spanish Republicans during the Spanish Civil War, where it was called Chato (snub-nose).[4]