Travelers on United Airlines Flight 990 from San Francisco to Paris experienced an unexpected detour when their Boeing 777-200 was diverted to Denver International Airport due to an engine issue. The incident,

United Airlines flights at Denver International Airport and other major American airports are grounded because of a “technology issue,” airlines officials said Wednesday night.

All flights have been halted at Denver International Airport on Sunday afternoon after severe thunderstorms moved into the region causing a flurry of delays and cancelations. The Federal Aviation Administration said the ground stop will last until 5 p.