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I am not sure which airport this was or is.
Not trying for an airport.
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The crash
The postal plane was flying the Contract Air Mail Route 17 (CAM-17). Soon after departure from Cleveland the engine failed and pilot Amberse M. Banks attempted to make an emergency landing. At 01:00 the plane was close to the ground when it hit a pole and caught fire. The plane was destroyed and the pilot was injured.
The mail
The plane carried 408 kg of mail which was recovered – mostly in partly burned condition.
The American Air Mail Catalogue list 5 different handstamps from this crash, but not the one illustrated below (C).
As this was a domestic flight it probably did not carry much mail for overseas destinations.
To see foreign destination covers look here:
http://crashmail.dk/air-crashes/1930-09-21/