Operations restored Friday morning, but delays reported at airports.
United Airlines was forced to temporarily ground all flights in the U.S. and Canada on Friday due to a systemwide outage.
Media reports said the outage affected boarding as well as the airline’s website and app.
Passengers took to social media to express their dismay over login issues, delays, and cancelled flights.
One commended an airline employee for how he handled the situation.
The issue appeared to be resolved just before 8 a.m., but some airports—including in Jacksonville, Florida, and Denver—cautioned travelers to expect delays.