Spoiler warning: Spoilers for the complete film.
Ethan stops the attack by getting the dangerous case into the aircraft’s hold and confronting Traveler there. Carry-On then jumps to the following Christmas, confirming his family survives and his ambition to become a police officer has become real.
Why does the New York boarding pass mislead him?
The pass Ethan sees points away from the Washington-bound flight carrying the true target. The plot is intended to benefit military contractors through a politically useful attack, rather than an arbitrary assault on whichever aircraft first appears connected to the case.
Mateo is also being coerced. Discovering his earpiece changes him from an apparent accomplice into another person whose loved one is threatened, even though the situation still turns deadly.
These details matter because Ethan initially has only fragments of a plan. Correcting the destination is as necessary as finding the device.
What does the suitcase swap accomplish?
Ethan exchanges the bag for a larger one, forcing it to be checked instead of remaining in the cabin. That gives him a place to reach the device before the planned release.
Traveler follows him into the hold. Ethan ultimately confines him inside a sealed compartment with the agent, preventing the exposure from spreading through the aircraft.
The solution belongs to the film’s fictional suspense mechanism. It should not be treated as a realistic guide to airport security or chemical containment.
Why show the next Christmas?
Ethan and Nora travel with their baby, alongside Jason and his family. The final badge confirms Ethan is now an LAPD officer.
That epilogue answers consequences the action alone could leave uncertain: the child is born, Ethan’s relationship continues, and Jason has not permanently disappeared from their lives after the harm done during the crisis.
Ethan also defends a security worker from an impatient traveler. He has gained a different job without treating his former colleagues as lesser people. The ending pairs his personal advancement with respect for the ordinary work through which the entire confrontation began.
Sources: official ending breakdown.