Look at the actual wreckage on the side of the WTC before the plane explodes, that doesn't look like a "Plane" other than the wings all you see is a "small hole the size of a car" and some of the wings.
So I offer this. What if the plane that hit the Pentagon came straight down, nose dive on the edge, wouldnt you have a "small hole" and relatively no wing marks if any?
Not to mention, havn't you seen what a plane does on impact with something hard (like a reinforced building, or ground), it all but disinigrates, there's usually nothing left larger than a square foot in size.
But, they could be right. They could have made 800 people disappear on four different airplanes, flown imaginary non-existant airplanes into buildings, setup hundreds of witnesses at the location of the Pentagon to say that it was a plane, and stolen the identity's of 19 Muslim Extremists, faked their footage of them getting on the airplanes along with the radio transmissions to ground control when they accidentally hit the transmit button instead of the cabin-announcement button, and used it all as a cover up so we could murder 3000 of our own citizens.