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Pilot slang for the the B-17 flying fortress.

The pimpmobile of bombers.
We still gots a few Aluminum Overcast's flying, thanks to the Confederate Air Force
by IrishRepublicanArmy November 16, 2003
One of the last remaining B-17G Flying Fortress bombers in exsistance. She's kept in the air by the Confederate Air Force, based in Midland, Texas.
Hey, Aluminum Overcast is going to be on display at the air show!
by Silverfox March 23, 2004