UK Orders Probe Into Air Traffic Control Failure After 2,000 Flights Hit
LONDON, UNITED KINGDOM — WEB DESK: Britain has ordered an investigation into a major air traffic control systems failure that disrupted around 2,000 flights and stranded hundreds of thousands of passengers, increasing pressure on the country’s air navigation provider after another major technology outage.
The government has given National Air Traffic Services (NATS) one week to investigate the failure and report back after Tuesday’s hours-long outage disrupted operations across major British airports.
Flights resumed, but disruption continued into Wednesday as airlines struggled to reposition aircraft and crews displaced by the shutdown.
NATS Given One Week to Explain Failure
UK Transport Secretary Heidi Alexander summoned NATS Chief Executive Martin Rolfe to explain what went wrong.
The government has instructed NATS to report on the incident within one week, while the Civil Aviation Authority will conduct a separate independent investigation expected to report within six months.
Alexander told parliament that the government did not currently believe the outage resulted from a cyberattack.
However, she rejected the suggestion that the disruption was unavoidable.
The transport secretary said passengers should not have to experience disruption on such a scale and that the independent review would seek to establish the cause and identify measures needed to improve the resilience of Britain’s air traffic control infrastructure.
What Caused the UK Air Traffic Control Failure?
NATS has identified the incident as a problem affecting its flight data processing system.
The organisation says the latest failure was different from the technical issue that caused widespread disruption in August 2023.
The exact root cause has not yet been publicly established, which is one reason the government has demanded a formal investigation.
NATS said it would conduct a full examination to determine what caused the problem and whether further action is required.
Safety was not compromised during the outage, according to NATS.
Around 2,000 Flights Affected
Aviation analytics company Cirium estimated that approximately 2,000 flights to and from UK airports were affected across Tuesday and Wednesday.
About 30% of scheduled departures were grounded on Tuesday, falling to around 5% on Wednesday as the network gradually recovered.
The impact extended across Britain’s aviation network, including major hubs such as Heathrow and Gatwick.
Even after the technical problem was resolved, airlines could not immediately return to normal schedules because aircraft and crews were no longer positioned where they were supposed to be.
Heathrow warned passengers about continuing knock-on effects as airlines attempted to restore their networks.
Hundreds of Thousands of Passengers Disrupted
The outage created significant disruption for travellers, with passengers reporting lengthy waits, cancellations, diversions and difficulty securing alternative flights.
Airports remained crowded after the system returned to service because airlines had to clear a large backlog.
The disruption extended beyond Britain because aircraft operating international routes were diverted or left out of position, creating further complications for subsequent flights.
Passengers at some airports were forced to remain overnight as carriers attempted to reorganise schedules.
Ryanair Reports £3 Million Loss
Airlines have sharply criticised NATS over the incident.
Ryanair said the outage had already cost it around £3 million, after the airline cancelled 260 flights affecting approximately 48,000 passengers.
Ryanair Group Chief Executive Michael O’Leary renewed his call for NATS chief Martin Rolfe to resign.
O’Leary described the latest outage as a repeat of the problems that caused severe disruption in 2023, although NATS insists the technical cause was different this time.
British Airways Cancels Hundreds of Flights
British Airways was also heavily affected.
The airline cancelled or diverted around 100 flights on Tuesday and said another 190 flights were cancelled on Wednesday, affecting tens of thousands of travellers.
The scale of cancellations illustrates why disruption continued well after the air traffic control system itself returned to operation.
When hundreds of aircraft and thousands of aviation workers are displaced from their planned locations, restoring schedules can take considerably longer than repairing the initial technical problem.
Second Major NATS Failure in Three Years
The latest incident has attracted particular scrutiny because it follows previous failures in Britain’s air traffic control network.
A major NATS shutdown in August 2023 caused widespread disruption and was estimated to have cost airlines around £100 million.
A separate radar-related technical issue in July 2025 also affected major airports, including Heathrow.
The repeated incidents have prompted airlines to question whether enough has been done to improve system resilience.
The latest outage is therefore being treated not simply as an isolated technology failure but as a broader test of the reliability of critical UK aviation infrastructure.
Airlines Question NATS Regulation
Airlines UK, which represents the aviation industry, has written to the government expressing concern about the regulatory system surrounding NATS.
Its chief executive, Tim Alderslade, argued that airlines are required to absorb substantial costs when passengers are disrupted even when the underlying failure lies outside the carriers’ control.
The issue has become more controversial because NATS paid £175 million in dividends in 2025 to its owners.
NATS operates as a public-private partnership, with ownership involving the British government, pension funds and airlines including British Airways and easyJet.
Ryanair has argued that more money should instead be invested in technology, staffing and operational resilience.
Passengers Still Have Rights After Cancellations
The UK’s Civil Aviation Authority said passengers would generally be unlikely to qualify for standard cash compensation if the air traffic control failure is classified as an extraordinary circumstance outside an airline’s control.
That does not mean affected passengers lose all their rights.
Airlines must still provide passengers whose flights are cancelled with refunds or alternative travel arrangements and, where applicable, reasonable care including meals and accommodation while they are stranded.
Travellers affected by continuing disruption should retain receipts for reasonable expenses and contact their airline regarding reimbursement.
Cyberattack Not Suspected
One significant question following a failure of such scale was whether Britain’s aviation infrastructure had been targeted electronically.
Alexander said current evidence did not indicate a cyberattack.
NATS has also described the incident as a technical failure involving its flight processing infrastructure.
The investigation will now focus on establishing the precise technical cause, why existing resilience measures did not prevent such extensive disruption and whether changes are required to avoid a repeat.
Pressure Builds on NATS Leadership
Martin Rolfe remains under pressure from airlines, particularly Ryanair, but the British government has not called for his resignation.
A spokesperson for Prime Minister Andy Burnham said the government continued to have confidence in the NATS chief executive.
The immediate test for Rolfe will be the report due within one week.
The independent CAA investigation will provide a longer-term assessment and could recommend technical, operational or regulatory changes.
UK Aviation Faces Major Resilience Test
The outage highlights the enormous consequences that can result from failure in a centralised air traffic control system.
Even a shutdown lasting several hours can affect thousands of aircraft movements because airports, airlines, crews and passengers operate within tightly interconnected schedules.
Once those schedules collapse, the disruption can continue long after the original technical problem has been repaired.
Britain’s immediate priority is restoring normal flight operations.
The larger question, however, is whether the investigation can explain why another major NATS failure occurred and what changes are needed to prevent Britain’s air traffic control network from experiencing a similar breakdown again.
