BA confirmed at around 4pm on Wednesday it had resolved the glitch affecting check-in and flight departures which blighted passengers attempts to travel throughout much of the day.

However, while the airline has said it plans to operate its normal schedule on Thursday, “there may be some knock-on disruption”.

More than 120 flights were cancelled at Heathrow on Wednesday, and at least 10 more at Gatwick. Hundreds more were delayed, with delays and/or cancellations reported at London City airport and airports in Edinburgh, Glasgow and Belfast.

In a statement issued at 10pm on Wednesday, BA said: “We have resolved the temporary systems issue from earlier today and apologised to customers who were affected. Any customers whose flights have been cancelled have either been rebooked or offered a refund.

“We plan to operate our normal schedule tomorrow [Thursday], however there may be some knock-on disruption. We continue to ask customers to check ba.com before heading to the airport to get the latest status of their flight.”