What is kind of sad is that people actually believe the flight 93 story. There are more questions than answers on that. They supposedly have an explanation of what the white jet was circling the crash site soon after it happened. They say it was a civilian airplane asked to help locate the site. Why would the gov't ask a civilian airplane for help when for 30 min prior they had already ordered all civilian airplanes out of the air? With the numerous 911 calls coming in from the Shanksville area, why did they need the crash site located? Plenty of people could tell them exactly where it was. Why were engine pieces found away from the crash site? Why was mail that the plane was carrying found 8 miles away?
Now I don't doubt that it was hijacked I just doubt the story of the heros trying to take control of the plane. If the passengers took control of the plane from the hijackers why then crash it? Why not try to land it somewhere? There was at least one passenger aboard who was licensed to fly small aircraft. He could have done better than a nosedive at 500mph.
There is not of room in that cockpit to fight a guy so the plane was out of control and way over the speed to make a recovery effort.
I think most people believe that the passengers were successfully overpowering the men outside the door to the cockpit, and the terrorists knew they could no longer complete their mission, so they just crashed the plane into the ground.
The terrorists knew it was possible that the passengers might also take back control of the plane, so it's also possible they crashed the plane to make sure they could at least kill those Americans.