A flight from Phoenix to Boston had to be diverted Monday morning after authorities said a pilot became ill and later died.

American Airlines flight 550 from Phoenix was diverted to Syracuse, New York, shortly after 7 a.m.

An airline spokeswoman said the co-pilot safely landed the plane with 147 passengers and five crew members onboard.

Details of the medical emergency and the deceased pilot’s name weren't immediately released. It also wasn't clear if the pilot died on the plane or after landing.