A United Airlines captain suffered an apparent heart attack while piloting a plane from Houston to Seattle and passengers stepped in to help with a doctor performing CPR and an off-duty pilot assisting in the emergency landing in Idaho.
The captain was still alive when he arrived at Saint Alphonsus Regional Medical Centre but died overnight while undergoing treatment.
Pilots are required to get medical certificates that show they don't have major heart problems, according to the Federal Aviation Administration website.
United flight 1603 from Houston to Seattle diverted to Boise for the medical emergency. The flight landed safely about 8 pm local time and was met by paramedics who took the pilot to the hospital. The Boeing 737-900 had 161 passengers and a crew of six on board.
Another pilot flew the original plane and passengers to Sea-Tac Airport.