CHICAGO _ United Airlines grounded all its flights for more than two hours Sunday night but the airline began working shortly after 8 p.m. Central time to get its airplanes back in the air.
The Chicago-based carrier grounded all its domestic flights at 5:30 p.m. due to a computer issue. International flights were not affected by the ground stop, which was made at United's request, the Federal Aviation Administration said.
"As of 8:00 p.m. CT, we have resolved the issue and flights are resuming," United said in a statement. "Customers may experience additional delays as we work to get flights out this evening. We apologize for the inconvenience to our customers."
The airline said it would waive fees for affected passengers choosing to change flights.
United said the problem affected the airline's ability to get information that allows flights to depart, such as weight and balance information, to the pilots. More than 200 flights were affected, though that number could grow, United said.
The delay was the latest in a run of technology problems at major U.S. airline carriers.
In November, United said technology-related flight delays declined 57 percent in 2016 compared with 2015 and were at their lowest level since 2012.
But United suffered an overnight outage that led to what a spokesman called "a few" cancellations the month before.
In August, a power outage in Delta Air Lines' operations center resulted in more than 2,000 flight cancellations over three days and Southwest Airlines also had to cancel more than 2,000 flights after an outage in July.
