More than 1,000 UK flights cancelled after air traffic control system failure

UK flight cancellations have disrupted thousands of journeys after a NATS technical failure, with passengers warned of continuing delays even after the system was restored.

LONDON: Thousands of travellers are facing another difficult day at British airports after a major air traffic control technical failure triggered widespread disruption. UK flight cancellations initially passed 1,000 following the September 8 outage, with further services cancelled on September 9 as airlines struggled to get aircraft, passengers and crews back into position.

The problem affected the flight data processing system operated by National Air Traffic Services, better known as NATS, which provides air traffic control services to 15 UK airports.

Heathrow, Gatwick, Stansted, Manchester and Birmingham were among the major airports affected, while disruption spread across the wider aviation network.

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What caused the UK air traffic control failure?

NATS identified a technical issue with its flight processing system on Tuesday afternoon.

The disruption lasted around four hours before engineers applied a fix. NATS later confirmed that the system was operating normally, but warned that recovering the aviation network would take time.

NATS chief executive Martin Rolfe said on September 9 that a cyberattack had been ruled out. The precise cause remains under investigation.

The outage quickly created a backlog because aircraft could not simply resume their original schedules once the technical problem was fixed.

Planes and crews were left in the wrong locations, while passengers needed to be rebooked onto available services.

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Are flights still being cancelled?

Yes. The knock-on effects continued into Wednesday.

Flight tracking data showed around 1,300 flights to and from UK airports were cancelled on Tuesday, with hundreds more cancellations recorded the following day.

That means UK flight cancellations have continued to rise even though the original system problem has been resolved.

Passengers travelling through British airports should therefore check their flight status directly with their airline before leaving for the airport.

Heathrow and Gatwick were among the airports warning travellers about continued disruption as airlines worked through the backlog.

The incident has also renewed questions about the resilience of Britain’s air traffic control infrastructure.

Transport Secretary Heidi Alexander summoned the NATS chief executive for discussions and said she was seeking assurances that lessons would be learned.

Airlines have also criticised the disruption, with some calling for changes at NATS following previous technical failures.

For travellers, however, the immediate concern remains getting journeys back on schedule. The flight cancellations can continue after a major outage because airlines need time to reposition aircraft and crews across their networks.

Impact to expect

Flight schedules could remain unsettled while airlines clear the backlog, particularly at Britain’s busiest airports. Travellers connecting between the UAE and UK should monitor airline updates closely, as disruption at Heathrow and other hubs can affect aircraft rotations and onward connections far beyond Britain.