Re: United 93
there is no purpose in 'replacing' the airliner with a missile.. what would that achieve?
There are numerous eyewitnesses to the event. You can't miss a huge plane that's flying so low right above your head on a freeway :)
There are also pictures of the debris, including airplane seats, parts of the engine etc. Seriously, anyone still pushing the "No Plane at Pentagon" theory is trying to discredit the whole 9/11 truth movement.