SPOKANE, Wash. (AP) — The Spokane Fire Department says a 16-year-old boy who died on a Delta Air Lines flight had a medical condition and was with members of his military family traveling from Seattle to Atlanta.

Assistant Chief Brian Schaeffer told The Spokesman-Review   the family members were traveling Saturday because the boy's father is being transferred from Joint Base Lewis-McChord in the Tacoma area.

The Spokane County medical examiner on Monday identified the boy as 16-year-old Zachary Bisiar. The medical examiner says his death was from natural causes, but the exact cause is not yet available.

The boy had been cleared for the flight but suffered a medical emergency. His heart and breathing stopped. The crew performed CPR but couldn't revive him.

The plane diverted to Spokane International Airport, where medics continued CPR without success.

Delta Air Lines Flight 128 had 258 passengers on board. Delta spokesman Michael Thomas says passengers later returned to the plane to complete their trip.