You're going to love this one.
I'll try to be brief. Okay, here goes; flight 77 landed and all the passengers were transferred to flight 93 and then flight 93 was shot down by an American Air Force plane under orders from Vice President Cheney. They were not all that clear where they stashed the airplane.
I blame TV. People give the government waaaay too much credit.
I think that it's absolutely hilarious that the same people who give serious creedence to the 'fact' that Pres. Bush is funcionally illiterate, also think that he could mastermind, and coverup, a plot like this to kick off World War III with the AlQueda terrorists.
But, I expect that if you called them out on this particular dichotomy, their heads would explode.
Area 51, obviously.