British Airways has apologised to passengers for delays after an IT glitch hit check-in systems.
Angry travellers complained of having to queue for hours at airports and some reported they had been told the problem was worldwide, reports the Press Association.
BA said in a statement: “We are checking in customers at Heathrow and Gatwick Airports this morning, although it is taking longer than usual.”
It added: “Our colleagues are doing everything possible to check in customers for their journey.”
One passenger stranded at Toronto Airport said: “I guess the check in application is down and it’s world wide.”