British Airways said Sunday it was still working to restore its computer systems and has resumed some flights from London airports, a day after a global IT failure crippled its services.

The airline said that it hopes to operate a “near normal schedule” at Gatwick and the “majority of services” from Heathrow on Sunday.

“Work continues to restore all of our IT systems but we expect some further disruption today,” BA said in a statement.


British Airways announced on Saturday that it had cancelled all its flights out of major London airports Heathrow and Gatwick after an IT systems failure. (Daniel Leal-Olivas/AFP/Getty Images)

BA cancelled all flights from both airports Saturday, upending the travel plans of tens of thousands of people on a busy U.K. holiday weekend. It blamed a power supply issue for the outage and said there was no sign it was under cyberattack.

BA operates hundreds of flights from Heathrow and Gatwick on a typical day — and both are major hubs for worldwide travel.

On Saturday, passengers at Heathrow and Gatwick faced long lines at check-in counters and the failure of both the airline’s website and its mobile app. BA said the crash also affected its call centres.

Many passengers complained about a lack of information from the airline.

“Some 80-year-old lady was standing around waiting for announcements, et cetera, and she fell over,” said Londoner Terry Page, who managed to get on one of the last flights from Heathrow to Dallas-Fort Worth Saturday. He and other passengers arrived, but their luggage did not.

‘A terrible, terrible day’

“We helped her up and she said ‘I’m just so tired,”‘ Page said. “It’s been a terrible, terrible day.”

The airline said it would refund or rebook customers affected by the IT failure.

While not that frequent, when airline outages do happen, the effects are widespread, high-profile and can hit travellers across the globe.

BA passengers were hit with severe delays in July and September 2016 because of problems with the airline’s online check-in systems.

In August 2016, Delta planes around the world were grounded when an electrical component failed and led to a shutdown of the transformer that provides power to the airline’s data centre. Delta said it lost $100 million in revenue as a result of the outage.

Flight affected at Toronto Pearson airport

At Toronto’s Pearson Airport Saturday afternoon, British Airways staff asked travellers booked on the 6:35 p.m. flight to leave the airport.

At about 3:30 p.m., the staff distributed a statement saying, “Customers will not be able to rebook at the airport, through our call centres, or online, until our systems are recovered. Please do not remain at the airport.”

It advised passengers requiring a hotel that they could claim “reasonable expenses.”

British Airways also advised the passengers to call 1-800-AIRWAYS, the airline’s phone number, to see if it had rebooked them. A recorded message on the line at 4 p.m. said there would be a wait of more than 30 minutes and advised callers to use the airline’s website.