British Airways is struggling with a major computer system failure as passengers at airports around the world complain of delays and long lines.
“Our IT teams are working as hard as they can to quickly fix a problem with our check-in system,” the airline said in a statement. “We’re sorry for the delays some customers are experiencing as they check-in for their flights.”
The company’s official Twitter account fielded a barrage of complaints from travelers at airports including Atlanta, Chicago and Boston late Monday. Others reported problems in the Bahamas and Mexico.
As Tuesday morning arrived in Europe, customers there also began to flag issues. The airline said checking in passengers at major London airports Heathrow and Gatwick was taking longer than usual.
Travelers in the U.S. said British Airways representatives had told them the system failure had been going on for hours and was global.
“Apparently computers are taking the #LaborDay2016,” tweeted Alex Kintzer, posting a photo of a long line at San Francisco airport.
It wasn’t immediately clear how many flights have been affected.
Some people shared images of hand-written boarding cards that BA staff had given them.
The disruption comes about a month after Delt was hit by a global computer outage that caused days of travel chaos, including about 2,000 flight cancellations.
Less than three weeks before that, Southwest Airlines canceled more than 1,000 flights following a system failure.
British Airways, the U.K.’s flag carrier, is owned by International Airlines Group, whose other businesses include Ireland’s Aer Lingus and Spain’s Iberia.
— Marilia Brocchetto and Ruairi Casey contributed reporting.
Correction: An earlier version of this story misstated the day of the week when passengers reported problems.