Salt Lake City airport spokeswoman Barbara Gann said Tuesday the passenger suffered a medical issue on the plane that arrived Sunday evening.
She says the person was assisted by paramedics and fellow passengers before being moved to a jetway and pronounced dead.
She corrected an earlier account from airline officials that the passenger collapsed on the jetway.
Army Reserve medic and passenger Jared Noall told KSL (http://bit.ly/Xyzedm ) he had heard loud snoring that later stopped but didn't realize something was wrong with the man until the plane landed.
Gann declined to release the passenger's identity. KSL says he appeared to be in his 30s.