London (CNN)British Airways has canceled all Saturday flights from London’s two biggest airports after “a major IT system failure” caused severe disruption to flight operations worldwide, the airline said.
“There’s no evidence it’s a cyberattack,” airline officials said.
The airline initially canceled only flights before 1 p.m. ET (6 p.m. BST) at Heathrow and Gatwick.
“We are working hard to get our customers who were due to fly today onto the next available flights over the course of the rest of the weekend,” the airline said in a statement Saturday afternoon. “Those unable to fly will be offered a full refund.”
The system outage — on Britain’s spring bank holiday weekend — has “affected our call centres and our website but we will update customers as soon as we are able to,” the airline said.
British Airways has not outlined how many flights were canceled, nor how many people were affected.
“Most long-haul flights due to land in London tomorrow (Sunday, May 28) are expected to arrive as normal, and we are working to restore our services from tomorrow, although some delays and disruption may continue into Sunday,” the statement said.
In response to tweets from travelers, the airline said it was experiencing a “global system outage” affecting its website, online check-in, contact centers and baggage tracing.
“Working on this as a matter of priority, but if your flight is departing tomorrow you may have to complete check in at the airport,” it tweeted to one customer.
The airline said it was “extremely sorry” for passengers’ inconvenience and was working to resolve the problem as soon as possible. Airline officials gave no indication of what might have caused the problem or when it would be fi