The Auster AOP.9 was a British military air observation aircraft ("air observation post") produced by Auster Aircraft Limited to replace the Auster AOP.6. == Design and development == The Auster AOP.9 was designed as a successor to the Auster AOP.6.
The Auster AOP.9 was a British military air observation aircraft ("air observation post") produced by Auster Aircraft Limited to replace the Auster AOP.6. == Design and development == The Auster AOP.9 was designed as a successor to the Auster AOP.6.
Source: Wikipedia "Auster AOP.9" · CC BY-SA 4.0
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