There appears to be no wreckage of a plane (mind you when a plane goes down it can be pretty much unrecognisable!!) However, the hole in the pentagon
appears to be too small for a passenger plane and considering the potential damage to be caused by the wingspan, it doesn't appear that the thing
that hit the pentagon had wings at all.

Wreckage outside building
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Piece of landing gear at C Ring wall
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Impact hole - plane slammed into Pentagon at ground level, wing hit first
floor - hole size about 80 feet (distance between jet engines), fuselage at
second floor - hole size about 20 feet
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Plenty of aircraft debris, also how come the bodies of the hijackers/
passengers were recovered from the Pentagon?