Not just fallen off, but vapourised.
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There may be a 'wide burn mark' at the front of the building but you surely cannot be serious in saying it would be wide enough to represent where the wings would have hit!?
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Well, it's very wide indeed, remember the Pentagon is an *enormous* building - 77 feet tall with faces 921 feet long, which gives the length of the burnt area, estimated from photos, as about 5 or 6 building heights, or 350 to 500 feet, approximately. This is three or four times the wingspan of a 757-200, which is 125 feet, near as dammit. Even at an angle (looking at the side of the building the plane hit, it came from the right-hand side at an angle of 45-55 degrees) that's still smaller than the burnt area.
Most of the damage is caused by post-impact fire, of course, but to provide enough fuel and energy to set fire to that much building must have taken something pretty large.
There is a photo of the remains of a jet engine on the net - it's on a conspiracy site and is used to try and claim that a much smaller jet hit the building - however this claim ignores the difference between a high-bypass turbofan like the RB211-535E4-B and a turbojet. The difference being that the turbofan has a big fan on the front and a much smaller diameter jet core towards the back - you don't see this on pictures, of course, unless the casing is open.
http://physics911.org/net/modules/ne....php?storyid=3
Cutaway of an RB211
http://www.eng.uct.ac.za/~victor/ele...rbine4_256.gif
Note the comparative size of the front fan and the first section of the compressor, and that this compressor looks very like the first photo on the physics911 site, minus blades.