British Airways cancels all flights out of London after computer system failure

British Airways canceled all its flights in and out of London's Heathrow and Gatwick airports on Saturday after a major computer system failure. Thousands of airline passengers, many who were travelling during a holiday weekend in the United Kingdom, were stranded due to the outage, while the airline's fleet was left grounded on runways. "It's a complete nightmare," one person stuck at Heathrow told Reuters, also describing long waits and confusion among the airline's staff. British Airways has not revealed the source of the computer failure but said there has been no evidence it was caused by a cyber attack. We're working hard to get anyone due to fly today, onto the next available flights.