Factual error: In one of the shots when the 757 is taxiing at Newark airport, you can see in the background an airliner in the new Air Canada colours. The current Air Canada livery was introduced in 2004.
Factual error: During the take off roll, the curtain that divides First Class and Economy class is closed. This is in breach of FAA regulations that state the curtain must be stowed for taxi, take-off and landing.
Factual error: In a scene in New York's air traffic control tower (I think the one where they show the second plane hit the south tower of the WTC), there is a man wearing a black lanyard around his neck that says "Transportation Security Administration" on it. The TSA was formed shortly AFTER the events of 9/11 thus he should not be wearing it.