The man, who has not yet been identified, passed away on flight 5596, which arrived at Salt Lake City's International Airport on Sunday night, according to airport spokeswoman Barbara Gann.
According to Army Reserve medic Jared Noal, who was on board the flight, the passenger collapsed shortly after the plane landed in Utah, at which point he and two others performed CPR on the man until paramedics arrived, the Daily Telegraph noted.
Paramedics, who were called immediately after the landing, later pronounced the man dead. Airport police and the state's medical examiner are still looking into the cause of death.
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