A technical failure in National Air Traffic Services' (NATS) flight data processing system cancelled more than 1,300 flights across UK airports on September 8, with a further 177 cancellations recorded the following day, according to flight tracking platform Flightradar24. The disruption triggered an immediate claims event for travel insurers and renewed scrutiny of UK aviation infrastructure.
The scale of the outage drew direct comparisons with the 2023 NATS bank holiday failure. Heathrow, Gatwick, Manchester, and Birmingham were the worst-affected airports, with 13 Heathrow-bound flights diverted elsewhere as ground congestion built. NATS chief executive Martin Rolfe apologised and confirmed a full investigation.
Under UK and European air passenger rights rules, air traffic control failures are classified as extraordinary circumstances, removing airlines' obligation to pay standard cash compensation, according to Civil Aviation Authority (CAA) guidance. Airlines retain a duty of care - meals, accommodation, and rebooking options - but without the compensation liability. That classification pushes affected travellers toward their travel insurance policies rather than their airlines.
Standard travel insurance typically covers delay claims once a qualifying threshold is reached - commonly two or four hours - along with cancellation costs where a flight is confirmed as cancelled. Policies generally exclude costs airlines are already legally required to meet. Travellers holding separate-ticket connections face the sharpest exposure, as no statutory rebooking right applies across independent bookings.
The 2023 NATS failure affected more than 700,000 passengers at an industry cost airlines subsequently put at more than £100 million in refunds and compensation. A further technical fault in July 2025 caused disruption lasting several hours across Heathrow, Gatwick, Edinburgh and other airports. Rolfe confirmed the September 2026 failure involved a different system from the one that failed three years ago.
Three failures from the same provider in three years, each at peak travel periods, represent a demonstrable accumulation history. Travel underwriters have historically priced UK aviation disruption as a low-frequency event. That assumption now has a loss pattern to test against.
The CAA's 2023 review issued recommendations for improving NATS system resilience, and a government progress report in July 2025 confirmed NATS had completed its share. A third failure followed fourteen months later.
Ryanair and Wizz Air both called for Rolfe's resignation. Transport Secretary Heidi Alexander summoned him for a meeting the following morning.
Early September is among the busiest periods for UK leisure and corporate travel. EasyJet cancelled 218 flights and British Airways more than 100, with aircraft and crew rotation backlogs expected to extend disruption into Wednesday, according to Flightradar24 and airline statements.
