On Tuesday, September 8, 2026, the United Kingdom’s air traffic control system shut down for approximately four hours, resulting in the cancellation of more than 2,000 flights across at least 15 airports including Heathrow, Gatwick, and Manchester. This widespread outage disrupted operations nationwide, affecting hundreds of thousands of travelers.
Military Flight Data Caused System Shutdown and Exposed Backup Deficiency
The failure originated when a UK military aircraft submitted inaccurate or “spurious” flight data into NATS’ flight-processing system. This faulty data triggered a chain reaction that forced the entire system to shut down. NATS, which manages UK air traffic control and is partly government-owned, confirmed the system lacked a dedicated backup
for the affected flight-processing component. The outage required multiple attempts over several hours to restore service.
Delays, Diversions, and Aircraft Misplacement Affected Passengers and Airlines
As a result of the shutdown, airlines experienced extensive delays, diversions, and cancellations. Flights arriving in the UK were sometimes diverted to alternate countries. Aircraft and crew were stranded at incorrect locations, causing additional cancellations and delays even after system restoration. Airports such as Luton and Glasgow also reported significant operational challenges during the disruption.
Official Responses and Criticism of NATS Leadership
The Ministry of Defence denied any military error, stating, “We do not believe there’s any indication of an error on the part of the military.” NATS CEO Martin Rolfe
described the incident as unprecedented in 50 years of operations and ruled out cyberattack as a cause, stating it was “something different that we’ve never seen.” Transport Secretary Heidi Alexander demanded answers, declaring that she did “not believe the issue was unavoidable” and ordered NATS to provide a detailed report within one week. Ryanair CEO Michael O’Leary criticized NATS management, accusing Rolfe of dishonesty and calling for his resignation. O’Leary stated, “We don’t need more investigations, we don’t need more reports, and we don’t need another parliamentary committee hearing where Martin Rolfe will promise change, will promise resilience and will
promise an effective backup system.”
Investigations Underway Following Previous 2023 Failure
NATS and the Civil Aviation Authority (CAA) are conducting investigations into the cause of the outage. The CAA is carrying out an independent review alongside NATS’ internal probe. This incident follows a major NATS system failure in August 2023 that affected approximately 700,000 travelers, which led the CAA to issue 34 recommendations for system improvements. NATS stated all recommendations had been implemented. The UK government holds a 49% stake in NATS, with the remainder owned by British Airways, easyJet, Virgin Atlantic, Heathrow Airport, and NATS employees. Airlines including Ryanair and Wizz Air have called for
significant reforms at NATS following the latest disruption.
