BAA spokesman:
"Due to an interruption to the air traffic control service, run by NATS at Swanwick, flights from many UK airports are subject to some delays and cancellations.
Aircraft continue to land and depart, however the process is slower than normal, which means that inevitably, some flights will be delayed and some will be cancelled.
We are working hard with the airlines to minimise disruption and restore the operation as quickly as possible.
Passengers are advised to contact their airline or see www.baa.com before travelling to the airport".
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