Bill Marks (Liam Neeson) is an alcoholic U.S. federal air marshal; his daughter died at age eight from cancer, his wife divorced him, and he enrolled in the Air Marshal service despite a fear of airplane takeoffs after he was discharged from the police force. On a non-stop flight from New York to London, Jen Summers (Julianne Moore) sits next to Marks after switching seats with cellphone programmer Zack White, who has already had several run-ins at the airport with Marks.
Midway over the Atlantic Ocean, Marks gets text messages on his secure phone stating that someone on the plane will die every 20 minutes unless $150 million is transferred into a specific bank account. Breaking protocol, Marks consults with the other air marshal on the flight, Jack Hammond. Hammond is revealed to be smuggling cocaine in a briefcase and Marks ends up killing him in a bathroom following an altercation; this occurs exactly at the 20 minute mark, resulting in the first death. As Marks attempts to stall for time with the texter, he works with the flight crew and Summers to discover the texter's identity. When 20 minutes runs out again, the pilot suddenly dies of poisoning.
The public becomes convinced that Marks is hijacking the plane, as the bank account is in his name and a passenger uploads video footage of him treating passengers aggressively with no explanation. The co-pilot has been instructed by TSA to ignore Marks and land in Iceland, the closest destination; he diverts the plane but continues to cautiously trust Marks. Marks has White design a hack which will cause the texter's cell phone to ring. Ringing the phone he discovers it in the pocket of a passenger, who claims to have never seen the cell phone before. Following a fight with Marks, the passenger dies in a similar fashion to the pilot.
Smoking in the bathroom, Marks finds a hole in the wall that allowed someone to shoot a poison dart at the captain; he finds that the most recently deceased passenger was struck with a dart as well. While Marks and Summers try to gain access to the texter's cell phone, it suddenly activates, sending automated messages to TSA implying that Marks is suicidal and is going to detonate a bomb on the plane. Marks finds the bomb hidden in the cocaine smuggled by Hammond. Unable to land the plane in time, he attempts to initiate a protocol of least damage: by bringing the plane low to equalize air pressure, placing the bomb in the rear of the plane, covering it with baggage and moving passengers to the front in order to contain the explosion and minimize casualties. As he begins to initiate these actions some of the passengers attempt to disable Marks, convinced by the media that he is a terrorist. Marks finally explains the situation to them and they agree to work with him.
Watching a video clip of himself handling passengers, Marks notices passenger Tom Bowen – whom he had initially cleared of any suspicion – slipping the texter's phone into the pocket of the second poison victim. Realizing that Bowen is the culprit, Marks engages him in a fight, and by then it was revealed that Bowen is working with White: as soldiers who were appalled by the lack of security at U.S. airports before 9/11, they hoped that framing Marks as a terrorist will lead to drastically increased security. Bowen is prepared to die with the plane and shoots White, who expected to get off the plane with the money. Following another fight, Marks shoots Bowen in the head. White recovers and attacks Marks with a knife, but White dies in the explosion as Marks retreats to the front of the plane.
The co-pilot manages an emergency crash-landing at a military base in Iceland after the bomb explodes, disregarding orders from his fighter plane escort; the plane is damaged in the landing but there are no casualties. Marks is hailed as a hero in the media, and the film ends with him and Summers beginning their friendship.
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