The departure control system (DCS) and the booking system known as Babs have caused problems for the past two days. The two systems handle bookings, luggage handling and checking-in on all BA flights.
Staff are having to deal with these process by hand, which is leading to delays on some flights.
BA is working with its service partner Amadeus to resolve the problem which a BA spokeswoman says occurred at the link between the two systems. Babs and DCS are due to be migrated to Amadeus’s own platform later in the year.