Numerous passengers flying with British Airways early Tuesday are not happy. An IT issue has caused global delays, leaving many stranded at airports for hours.

The company stayed largely silent on its main Twitter account, but has apologized in reply to hundreds of customer complaints about late flights and inability to check-in.

“We are sorry for the delay to our customers’ journeys,” the company announced on its web page. “Check in may take a bit longer than usual, so we would encourage customers to check in online before they reach the airport.”

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