I know you probably won't read it Hxtr because your mind is made up that the federal government and tens of thousands of other people conspired together to kill all of those people on 9/11, and somehow every single one of them has kept the secret, but read what it has to say on this link which can debunk every single claim made by the conspiracy theorists.
http://www.popularmechanics.com/technology/military/news/debunking-911-myths-planes
If American Airlines flight 77 didn't really hit the Pentagon, where is the crew and the passengers? Are you contending that our government conspired to kill all of those people, completely hid all evidence of that jet then fired a missle at the Pentagon? Oh and I almost forgot the best part, that missle must have been full of American Airline jet parts because there were literally tons of plane debris found in and around the Pentagon. Were there men in black suits running around just after the impact planting all of that debris? Our government can't do anything right, and yet they can somehow pull this off without anybody that was involved telling the truth?
If you don't think a commercial airline can fly at that angle at that speed, check out footage of the Korean airline that recently crashed in San Francisco. Now imagine the jet hitting the solid walls of a building instead of ending up on a runway. The one that hit the Pentagon wasn't going 500 mph, it was coming in low and slow at a shallow angle, just like the jet in the link below.