Known as the FOS, the system handles the airline’s operations, key to getting airplanes released for departure — including passenger boarding. American Airlines has backup flight planning ...

WASHINGTON — American Airlines briefly grounded flights nationwide ... experienced trouble with its flight operating system, or FOS. The airline blamed technology from one of its vendors.

a union representing American Airlines pilots, said the airline told pilots at 7 a.m. Eastern that there was an outage affecting the FOS system. It handles different types of airline operations ...

Dennis Tajer, a spokesperson for the Allied Pilots Association, a union representing American Airlines pilots, said the airline told pilots at 7 a.m. Eastern that there was an outage affecting the FOS ...