Significant technical issues resulted in a number of flight cancellation on Friday.
The airline said the problem was not caused by a cyber- attack.
We are experiencing significant technical issues this evening which are affecting the running of our operation and unfortunately has led to the cancellation of a number of flights.
It was trying to get as many flights away as possible, and customers on flights that had not been canceled could still check in at the airport.
The airline, owned by IAG, was hit by a computer system failure that stranded 75,000 passengers over a holiday weekend, sparking a public relations disaster and pledges from the carrier that it would do better in the future.
One customer posted a video of long lines at check-in for a Miami to London flight, while another user posted pictures of blank screens, asking when the problem would be fixed.
British Airways and Virgin Atlantic began flying around Russian airspace on Friday after London and Moscow banned each other's airlines.
Britain's National Cyber Security Centre, a part of GCHQ, warned companies and organizations to strengthen their online defences after Russia invaded Ukraine.
The airline said it would make decisions about its schedule on Saturday.