I really don't get why these people do this. First of all, if a plane didn't crash there, where'd the fucking plane go? What motive would the US Government have to blow up part of the Pentagon? If a car bomb did go off there, where is the plane? Man, I knew a guy that died in the Pentagon. It <b>definitely</b> happened. A plane definitely hit it. There were eyewitnesses that saw the plane coming in really low, hit the ground before the Pentagon and slide into it. People like this are just... retarded.
Here's a good debunking of this stupid stupid theory:
http://www.snopes2.com/rumors/pentagon.htm