More than 1,000 flights were cancelled or delayed across major British airports after a technical glitch struck air traffic control provider Nats on Tuesday.
A critical technical issue within the flight processing system of the UK air traffic control provider Nats paralysed aviation operations on Tuesday, creating widespread gridlock that lasted into Wednesday. The afternoon stoppage, which began at approximately 1pm, forced monitoring services to log over 1,000 cancelled departures and arrivals across the country’s aviation network by evening.
Major hubs including Heathrow, Gatwick, Manchester, and Birmingham absorbed the heaviest impact, leaving travelers stranded on runways and crowding terminal desks. International carriers and domestic operators alike scrambled to manage a growing backlog of grounded aircraft and displaced crews.
System Breakdown and Repair Timelines at Nats
Nats announced at 1.46pm that it was investigating a technical issue affecting flight departures. Engineers eventually identified a fault in its flight processing system and implemented a fix at 4.40pm, nearly four hours after the disruption began. Despite the resolution, aviation authorities warned that the recovery process would be complex and protracted.
“This has been a very complex recovery and has created difficulties for the whole aviation network, from which it will take time to recover.”
The organisation stated that the underlying fault was not the same as previous outages recorded in recent years. While a spokesperson confirmed that the system failure was not the result of a cyber incident or a hack, Nats leadership acknowledged that resolving the backlog had taken longer than hoped.
Airport Gridlock and Scale of Passenger Disruption
The disruption hit airports across the UK and sent shockwaves through European airspace. Heathrow initially paused departures around lunchtime before traffic briefly resumed, but incoming flights faced severe shortages of gate space as planes failed to depart. Heathrow ultimately suspended arrivals for the remainder of the night, while dozens of flights were delayed or diverted.
Operational data from regional hubs underscored the widespread nature of the stoppage. London City airport saw more than 60 per cent of its flights cancelled, while Manchester Airport recorded delays on 91 per cent of its schedule. Major international carriers including Emirates and Qatar Airways issued advisories warning passengers of disruptions and possible rerouting for flights transiting UK airspace.
Airline Backlash and Calls for Executive Overhaul
The incident provoked sharp rebukes from major airline executives, who renewed long-standing demands for structural reform at Nats. Ryanair reported that more than 65,000 of its passengers had experienced delays, prompting executive calls for the resignation of Nats chief executive Martin Rolfe.
“The UK Government, the CAA and the Nats Board must stop making excuses for repeated Nats failures and appoint a new leader capable of running the UK ATC system without repeated failures. Its time for overpaid failure Martin Rolfe to go.”
COO Neal McMahon
Wizz Air joined the criticism, describing the service as not fit for purpose
in its current form and arguing that critical national infrastructure should not repeatedly bring the aviation system to a standstill. Political pressure mounted as well, with Shadow Transport Minister Greg Smith questioning why Britain cannot keep its own skies open given the government’s 49 per cent stake in the service provider.
Leadership Response and Responsibility
Addressing the criticism during a broadcast appearance, Nats chief executive Martin Rolfe expressed regret over the widespread travel chaos.
When questioned about his position, Rolfe maintained that there would be lots of time for that later
while his immediate priority remained working through the night with airlines and airports to clear the backlog. He added that the service did not yet have a definitive cause for the technical malfunction.
Ongoing Schedule Recovery and Passenger Guidance
Airlines warned that the knock-on effects of the airspace closure would continue to affect flight schedules. British Airways confirmed that normal operations would be disrupted through Wednesday at least, offering affected customers free rebooking options through Friday. Travelers across major terminals were advised to verify their flight statuses directly with individual carriers before attempting to travel to departure airports.
