Originally Posted by
RobertS975
AA 77 and UA 93 knew precisely where they were headed. It certainly would have been easy for the investigators to figure out whether they were on a VOR radial or not. UA93 turns around over Cleveland... certainly too far to receive any of the DC VOR signals, yet its course does not waver until the passengers interfered with the hijackers' plans.
It's also very possible that the hijackers' first demands to the pilots were "Take us back to Newark" or "Take us to Reagan National" and the pilots set the initial course. Remember that pre-9/11 the response to a hijacking was to do whatever you were told.