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A largely trouble-free day is predicted for Gatwick, Heathrow and Stansted airports but there may be further disruption at other airports after yesterday's glitch with air traffic control.
Flights were cancelled or delayed after problems with a telephone system at the National Air Traffic Service.
The problem was resolved at about 7.30pm yesterday. The disruption is likely to have a knock-on affect at some airports today but London's three main airports say their flights should run relatively smoothly.
Thousands of passengers have been left stranded at all of London's airports after an unprecedented technical glitch.
Hundreds of flights have been cancelled or delayed and, as Luke Hanrahan reports, the knock-on effect means the problems could continue long into this evening.
Thousands of people have been affected after a technical problem at an air traffic control centre caused chaos at airports across the UK.
- Heathrow cancelled 217 flights so far today
- Gatwick cancelled five flights but experienced 86 delays
- Stansted said flights had been delayed by up to three hours
The National Air Traffic Service said an issue with its system, which has led to flight delays and cancellations was unlikely to be fixed until between 6.30pm and 7pm.
The issue has affected flights from Stansted, Heathrow and Gatwick airports, as well as many other across the country.
Heathrow - had cancelled 60 flights by 9.45am, with that figure split roughly equally between departures and arrivals.
Stansted - departing flights have been subject to delays of between 30 minutes and two hours.
London City Airport - about 50% of its flights have been disrupted.
Luton - inbound flights have been unaffected but outbound flights have been hit.
Gatwick - 20% of departures have been delayed, with passengers warned they could wait for "a couple of hours".
National Air Traffic Services (Nats) does not currently know how long it will take for the technical glitch - which is affecting thousands of people at airports including Heathrow, Stansted and Gatwick - to be rectified.
Nats said the issue arose at its control centre in Hampshire, in the early hours of the morning when a computing glitch meant the night-time operation failed to properly switch over to the daytime system.
Latest ITV News reports
Thousands of passengers at airports, including Heathrow, Stansted, Gatwick and London City, are facing major disruption.