More than 1,000 flights were cancelled or delayed across UK airports on 8 September 2026 due to a technical failure in the National Air Traffic Services (NATS) flight processing system. The disruption affected major hubs including London Heathrow, Gatwick, Stansted, Birmingham, Manchester, and Belfast, stranding thousands of passengers nationwide.
NATS System Failure and Resolution
The cause of the disruption was a malfunction in NATS’s flight processing system, which serves 15 UK airports. Engineers worked urgently on site to resolve the fault, which led to extended recovery times beyond initial expectations. NATS confirmed the issue was fixed by the end of the day and that operations
resumed to normal, but warned that clearing the backlog of flights would take additional time. “Our system issue is now resolved, we are operating normally and working as hard as possible to clear the backlog of flights,” NATS stated.
Passenger Experiences and Flight Diversions
Passengers faced delays up to eight hours, with Ryanair reporting 65,000 customers affected. Some flights, including those from London to Shanghai, were diverted to Cardiff due to crowded airspace over the capital. At Stansted and Heathrow, numerous flights remained stranded on tarmacs for hours. British Airways reported one flight delayed at Heathrow for more than two and a half hours, impacting
travelers such as a passenger headed to a family wedding.
Other passengers abandoned flights after protracted delays; Josie Donoghue left a Ryanair flight to Ireland after spending three hours waiting on the runway at Gatwick. Manchester City football fans were stuck trying to fly to Porto for a Champions League match.
Official Responses and Airline Impact
Heathrow Airport suspended all arrivals for the remainder of 8 September to ensure safety amid the technical issues but resumed departures with ongoing disruption. Ryanair’s Chief Operations Officer Neal McMahon condemned NATS for “yet another UK ATC system failure” and demanded government intervention. British Airways described the situation as
“entirely out of our control” and said it maintained contact with affected customers.
British Transport Secretary Heidi Alexander expressed relief at the fault’s resolution and called for assurances that aviation support systems will improve. She also urged patience, stating, “It will take time to fully resume flights, so continue to check with airlines.” Air India alerted customers to delays on UK flights due to the NATS failure.
Airline Cancellations and Operational Challenges
British Airways recorded 96 cancellations, while easyJet had 92, KLM 20, Lufthansa 12, and Swiss 11. The disruption caused widespread flight delays and cancellations not only at Heathrow and Gatwick but also at
Manchester, Edinburgh, Luton, Birmingham, Aberdeen, and Glasgow airports. Despite flights continuing to depart and UK airspace remaining open, crowded airspace and processing delays forced many flights to be restricted or diverted.
Ongoing Recovery and Passenger Advice
Recovery from the technical fault continued into the following day, with airlines and air traffic control working to manage backlog clearance. Passengers were advised to monitor communications from their carriers as delays and cancellations persisted. Previous failures in NATS’s IT systems in 2023 and 2024 had already generated significant aviation disruption and compensation costs, underscoring ongoing vulnerabilities in the UK’s air traffic management infrastructure.
