I'm convinced United 93 was shot down or otherwise brought out of the sky, and the media/government decided to cover it up.
I'm fine with it, people on the plane were fucked anyway and putting the plane down where it wouldn't kill anyone else was the right thing to do. And there's plenty of people who won't get that, so covering it up is the right thing to do also. Choices suck.
So the government faked all the phone calls from the people on the plane to their loved ones, and the black box?