Plot hole: When Rane and the other terrorists come out the bottom of the plane and start walking towards the fairgrounds, it is amazing how not one police officer or staff member of the airport notices that they came out from under the plane, or that they don't seem to be walking off the plane like the other passengers.
Plot hole: When the police and FBI arrest Rane at the fairgrounds, Cutter tells them Vincent (one of Rane's men) is also at the fair, and wearing a tan jacket. Cutter did not see Vincent leave the plane and never saw him at the fair, and when he last saw him on the plane he was not wearing this jacket. So how could he know Vincent was at the fair and wearing a tan jacket?
Plot hole: While Cutter is in the bathroom, the first thing he hears of the terrorists taking over the plane, is one of them yelling "sit down". If he heard that, how could he have not heard the gun shots when Ms. Ritchie shot the FBI agents, or the sounds of screaming passengers?