Hundreds of flights delayed, cancelled after UK air traffic control glitch

A technical fault at National Air Traffic Services (NATS) on Tuesday led to widespread disruption across UK airports, with hundreds of flights cancelled or delayed. The provider said the issue affected its flight data processing system, apologized to travellers and reported the fault had been fixed, while recovery from the backlog was still underway.

Flight-tracking data showed the immediate operational effects: roughly 490 departure delays across six airports and about 525 arrivals either cancelled or delayed at those same sites, measured at 15:18 GMT. Airlines reported substantial passenger impacts. Ryanair said more than 65,000 of its customers experienced delays up to eight hours and that it had cancelled in excess of 50 flights. The carriers operations chief publicly criticised NATS and called into question the organisation's recent performance.

Aviation experts warned how quickly even a short outage can ripple through tightly scheduled airline networks. Analyst John Strickland said that a few hours of system failure can produce major knock-on effects because airline timetables and aircraft rotations are interdependent, multiplying the disruption across multiple airports.

The failure comes three years after a previous NATS flight-plan processing breakdown that caused larger-scale disruption. Britains independent aviation regulator, the Civil Aviation Authority, said it expects NATS to provide a full report on Tuesdays failure and that it will then assess whether regulatory or operational changes are needed to improve the resilience of the UKs air traffic control system.