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Re:Dark spot under cockpit of A-10s by cushychicken on Thursday March 06, 2014 @10:38AM (#7354283)
Interesting answer. My offhand guess would have been discoloration in the metal due to heat put off by this monster:

http://en.wikipedia.org/wiki/GAU-8_Avenger

Re:Dark spot under cockpit of A-10s by lake_rogue on Thursday March 06, 2014 @10:52AM (#7354411)
My guess was a variation: as a warning to ground personnel not to touch that area of the fuselage, as after any recent firing of the GAU-8 that area would be "HOT PLATE".