There are recoil systems for the recoil and the AC-130 is a big plane made of metal.
Anyway, I didn't mean the USA developed the A-29 but the A-67 that I linked earlier:
http://en.wikipedia.org/wiki/US_Aircraft_A-67_Dragon
The manufacturer, US Aircraft Corp., is based in the USA according to their website: http://usaircraftcorp.com/contactus.php
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