Numerous passengers flying with British Airways early Tuesday are Watch Daughter in law Wrong Relationship Onlinenot 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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There's no word on how many flights, exactly, were delayed, and on which airports, but BA did later update the announcement it is "now checking in customers at London Heathrow and Gatwick Airport as normal." It's unclear whether this means the issue is fully solved, as we've seen Twitter reports of delays to BA flights on other airports, too.

The incident echoes a recent (although, it seems, far more serious) mass delays across Delta's network, which was caused by a power outage that took down the company servers in early August.

British Airways hasn't yet disclosed the exact reason behind the delays.