This is the second time the airline has experienced IT problems in recent weeks
British Airways flights are being affected by a "technical issue", the airline announced on Wednesday afternoon, in the latest in a series of damaging IT problems.
BA said in a statement: "We're investigating and working hard to resolve a technical issue and apologise for the inconvenience.
"We will provide further updates as quickly as possible."
The airline issued the statement after customers started questioning delays on social media.
Some passengers posted updates suggesting planes were delayed at Heathrow's Terminal 5 base, with customers facing long delays at check-in,
Sky News reported.
https://twitter.com/turningleftfor/status/1509172065022234627
https://twitter.com/AnnuAlt/status/1509181870575173645
The airline experienced problems
a month ago, which led to flights being delayed and cancelled. BA's website and mobile app was impacted leaving customers unable to book flights or check-in online before departure.
This is a breaking news story. More to follow.