The role of Kyle was originally written for a male character, but when Jodie Foster expressed interest, the filmmakers felt she was strong enough to carry the part and cast her instead. See more...
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Factual error: The Royal Canadian Mounted Police are shown checking baggage in the final scenes at the same time that FBI agents are making arrests. The flight landed in Goose Bay, Newfoundland and Labrador, Canada. According to the Criminal Code of Canada, any crime committed during an international flight that ends on Canadian soil is deemed to have been committed in Canada. That being the case, the RCMP as the national police force has full jurisdiction. There is no way the FBI would be involved at that point.
Plot hole: Bomb squad vehicles are present at the airport when the plane lands. There is no bomb disposal unit in Goose. If one is needed it has to come from two provinces away - travel time by vehicle, in March, going flat out: minimum 20 hours + a 2.5 hr ferry trip. Not to mention that the markings on said vehicles are American: transportation of those vehicles from the US wouldn't have been any easier than from Canada, on the contrary, so again, they wouldn't have had the time to bring them over.