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.Volanges
Plot hole: The whole concept of a kidnapper 'pretending' his victim didn't get on the plane in the first place is utterly laughable. Even if nobody saw her in her seat, why didn't they see her walking down the aisle to her seat, or waiting to board the plane, or in the boarding tunnel itself? Why isn't she listed on the passenger manifest, or on her mother's travel documents or airline ticket? And there would have been security cameras all over the airport.
Continuity mistake: Near the end when the Air Marshall is getting off the plane to "get the two agents" there is a shot of him from behind walking off the plane with snow covering most of the ground, but when the shot cuts to a wide shot from the side of him all the snow is gone.
Plot hole: Along with the $50 million, one of "Kyle's demands" from Carson is that the FBI provide "her" with a Gulfstream III plane, which is presumably which he plans to escape on. This is actually the stupidest mistake he might have made. If his plan had succeeded in framing Kyle and having her holding the detonator in her hand dead, he wouldn't just allowed to leave like that, mostly because with the threat over the plane would have been withdrawn. His $50 million might have been withdrawn too, if his account wasn't protected.
Factual error: Carson says that the explosives were put inside the casket because caskets aren't X-rayed. Even though often times cargo such as the casket are sent by "known shippers", and known shippers check screen the casket, they are still X-rayed by airport security. There are no exceptions to X-raying cargo, even if it was already deemed secure.
Plot hole: Carson states to the captain that Kyle is a "hijacker" and is threatening to blow up the plane unless they transfer $50 million to an account (which we don't see.) He also tells the captain that she refuses to negotiate, and to agree to the ransom without speaking to her. In the next scene, Carson receives a call from the captain that the money has been transferred. Law enforcement would never agree to a ransom demand without talking or knowing who the so-called hijacker is. When Kyle later looks outside the plane, she sees bomb squad and law enforcement treating her as the hijacker. There is no proof or evidence that Carson has given that Kyle is a hijacker, nor is there a background check or identity on her. Law enforcement would have never treated this so seriously as they did at the end, nor would bomb squad have had the time to make it, as mentioned in another mistake.
Plot hole: The hijackers somehow know who Kyle is, and what her job is, and what kind of family she has even though Kyle doesn't appear to have known them prior to meeting them on the plane. The only time she met the morgue director was at the beginning of the movie when she went to see her husband's body before deciding to board the plane, so there is no way they could have known who Kyle was, and that she had a husband, and an only child, for a whole host of reasons. Firstly, the information about passenger plane designers is protected by very tight security to keep people from having access to to it. Secondly, passenger plane designers are secretive people who don't speak publicity about their jobs. Thirdly, passenger plane designers rarely interact with Air Marshals, and flight attendants, as they all work in different places. These three reasons I mentioned are to keep people from learning about avionics engineers, and their families in order to prevent the exact thing the hijackers were the trying to do - framing an avionics engineer.