UK Air Traffic System Failure Triggers Mass Disruption

A technical failure at the United Kingdom’s primary air traffic control provider grounded flights and disrupted travel for hundreds of thousands of passengers on Tuesday. More than 1,000 flights were cancelled across the country, with widespread operational delays expected to continue into Wednesday as airlines manage a severe backlog.

The breakdown began around 1:00 p.m. on Tuesday when a technical fault hit the flight processing system at Nats, the service provider overseeing air traffic control for 15 major British airports. Nats announced an investigation at 1:46 p.m. and reported that the system was repaired by 4:40 p.m. However, the four-hour outage halted departures and stranded aircraft across the European flight network.

Impact Across British and European Airports

The disruption initially hit departures at major UK hubs, including London Heathrow, London Gatwick, London Stansted, Manchester, and Birmingham. It quickly expanded to affect arrivals across southern England and secondary airports such as Edinburgh and Belfast. European airspace coordinator Eurocontrol reported that several inbound flights were held at airports abroad.

By Tuesday evening, plane tracking site Flightradar24 recorded more than 1,000 cancellations across the UK. Heathrow suspended all incoming flights for the remainder of Tuesday night while allowing delayed departures to resume. Flightradar24 also reported that at least 177 flights scheduled for Wednesday had already been cancelled, with nearly all affected services based at Heathrow.

Airline Operations and Calls for Resignation

Airlines reported extensive operational damage due to displaced aircraft and crews. British Airways diverted or cancelled more than 100 flights on Tuesday afternoon, affecting tens of thousands of travellers, and offered customers free rebooking options through Friday. Ryanair stated that over 65,000 of its passengers experienced delays alongside 50 flight cancellations, while easyJet reported knock-on impacts throughout its European network.

The outage prompted renewed criticism of Nats from low-cost carriers. Ryanair chief operating officer Neal McMahon demanded the resignation of Nats chief executive Martin Rolfe, stating that travellers “have once again paid the price for Nats’ abhorrent failure.” Wizz Air also criticized the provider, stating that Nats “is simply not fit for purpose in its current form.”

Government Engagement and System Recovery

In response to the criticism, Rolfe acknowledged the disruption and stated that Nats would work through the night alongside airports and airlines to clear the backlog. “We absolutely take responsibility for this,” Rolfe said, adding that systems had returned to normal operations.

A spokesperson for Nats noted that the recent fault differed from system breakdowns in 2023 and 2025. Transport Secretary Heidi Alexander was scheduled to receive a formal briefing from Rolfe on Wednesday before addressing Members of Parliament during the second reading of the civil aviation bill. Alexander confirmed that technicians resolved the glitch and said she was seeking assurances that aviation support systems remain reliable.

Background

Nats provides air traffic management services to 15 major airports across the United Kingdom. Tuesday’s system failure marks the third significant operational stoppage for the provider in just over three years, following an isolated outage in 2025 and a nationwide system crash in August 2023 that prompted a parliamentary inquiry.