British Airways travellers have been warned of possible further delays to flights, despite fixing an earlier IT glitch that crashed online check-ins.
The airline cancelled 117 flights at Heathrow and 10 at Gatwick, affecting more than 15,000 passengers.
More than 300 other flights have also been delayed, with some more than five hours behind schedule.
The problem was fixed late on Wednesday, but the airline warned of further disruption to flights due to the knock-on effect of the disruption.
Via Sky News