London: British Airways cancelled all its flights from London's two main airports until Saturday evening after a global computer system outage caused massive delays and left planes stuck on runways.
BA said there was no evidence the problem had been caused by a cyber attack.
"Please do not come to the airports. We have experienced a major IT system failure that is causing very severe disruption to our flight operations worldwide," the airline said in a statement.
"We are extremely sorry for the inconvenience this is causing our customers and we are working to resolve the situation as quickly as possible."
The problems, which passengers said were had affected flights across Britain, came on a particularly busy weekend with a public holiday on Monday and many children starting their school half-term breaks.
Passengers trying to catch planes in Britain on Saturday reported long delays at check-in desks and flights being held on runways.
"Still on the tarmac at Leeds. #britishairways reckon Heathrow is so backed up we can't set off. No way we'll make our Vegas flight," one passenger David Raine wrote on Twitter.
Another, journalist Martyn Kent, wrote: "Sat on plane at Heathrow for hour and a half now. @British_Airways Captain describes IT problem as 'catastrophic'."
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