Flightradar24 data shows planes gathered at Heathrow and Gatwick airports on Monday, 28 August, as an air traffic control failure hit the UK.<br /><br />Hundreds of thousands of airline passengers faced potential delays and cancellations on Bank Holiday Monday, one of the busiest days of the year.<br /><br />Aircraft on the ground were being held and planes already in the air were likely to be diverted to other airports in Europe.<br /><br />Eurocontrol, Europe's air traffic control agency, said Britain is "experiencing a flight data processing system failure" causing "very high" delays.
