NATS Fault Cancels More Than 1,000 UK Flights

NATS said its flight processing system was running normally again at 7.30pm on 8 September, after more than 1,000 UK flights had already been cancelled. Flightradar24 logged that evening tally around 8pm, while airspace stayed open and the company said safety was not compromised.

The backlog did not clear with the software. British Airways cancelled or diverted more than 100 flights. Ryanair said delays ran up to eight hours. Transport Secretary Heidi Alexander was due to see NATS chief executive Martin Rolfe on 9 September, before she spoke in the Commons on the Civil Aviation Bill.

NATS Called the Fault Fixed by 7.30pm

The first public note went out at 13.46 BST: engineers were on site, departing flights were taking a hit, and passengers should check with their airline. At 15.25 the company identified the issue in its flight processing system, still insisting flights were departing and that UK airspace was open. A fix was in at 16.40. The “operating normally” line came at 19.30, five hours and 44 minutes after the first alert, with an apology for a recovery that had “taken longer than we had hoped.”

By 22.10 NATS was still talking about a “very complex recovery” for the whole aviation network, and telling passengers to check flights that night or the next day. That is the gap that wrecked the evening: the processor can come back while aircraft, crews and slots are already in the wrong place.

THE NATS UPDATE CLOCK

1. 13.46 BST, 8 September 2026: NATS says it is investigating a technical issue causing disruption to flight departures.
2. 15.25: Engineers have traced the fault to the flight processing system. Airspace remains open.
3. 16.40: A fix is in and the flight system is “starting to recover.”
4. 19.30: The system issue is “now resolved” and NATS says it is operating normally while it clears the backlog.
5. 22.10: Recovery is still “very complex.” Passengers should check flights that night or the next day.

Rolfe, chief executive since 2015, said he always accepts full responsibility and that his job on a day like this is to keep people safe and restore the service. He also said these events are “relatively rare,” and that he would look at the investigation after the operational mess.

ℹ️ Technical issue

Recovery from today’s system issue has taken longer than we had hoped . Our system issue is now resolved, we are operating normally and working as hard as possible to clear the backlog of flights. (1/2) https://t.co/NpFp3PBDo7

— NATS (@NATS) September 8, 2026

More Than 1,000 UK Flights Were Cancelled

Flightradar24’s evening count is the figure that stuck: more than 1,000 cancellations by about 8pm. An earlier 6pm snapshot from the same tracker had 625 cancellations, including 218 easyJet flights, 132 British Airways flights and 41 Ryanair flights, which shows how fast the board went red once outbound traffic stalled.

NATS provides air traffic control at 15 major UK airports and, in its latest year, handled 2.54 million flights, up 2.4 percent from 2.48 million. Heathrow, Gatwick, Stansted, Manchester and Birmingham took the heaviest blow. London City, Luton, Edinburgh, Bristol, East Midlands, Liverpool, Aberdeen, Glasgow, Southampton, Southend, Belfast and Jersey all warned of delays or told passengers to check before they travelled. Dublin was pulled in as UK flow restrictions spread.

WHAT AIRLINES AND TRACKERS DISCLOSED

FlightAware, at 15.18 GMT, already had 490 delayed departures and 525 arrivals cancelled or delayed at just six airports (Heathrow, Gatwick, London City, Luton, Edinburgh and Bristol). Birmingham said departures restarted at 18.40 and that it was still working through the backlog with NATS, airlines and handlers.

THE EVENING SNAPSHOT

• National cancellations: Flightradar24 counted more than 1,000 UK flights cancelled by about 8pm on 8 September.
• Ryanair: More than 65,000 passengers delayed, with delays of up to eight hours and more than 50 flights cancelled.
• British Airways: More than 100 flights cancelled or diverted, hitting tens of thousands of customers.
• Next morning: Flightradar24 listed at least 177 cancellations on 9 September, nearly all at Heathrow.

Josie Donoghue sat on a Gatwick aircraft for three hours before her Ryanair flight to Ireland was cancelled. That is the passenger version of a ground stop: you board, you wait, then the rotation dies anyway.

Ryanair Wants Martin Rolfe to Resign

Ryanair did not wait for the 19.30 all-clear. The airline said over 65,000 Ryanair passengers delayed and more than 50 of its flights were cancelled, and chief operating officer Neal McMahon called for Rolfe to go.

How many more failures do passengers have to suffer before overpaid failure NATS CEO, Martin Rolfe, accepts responsibility for his repeated mismanagement and resigns? Over three years after NATS’ catastrophic 2023 system meltdown, it’s clear that nothing has changed.

Neal McMahon, Chief Operating Officer, Ryanair statement, 8 September 2026

McMahon also said that after 2023 the industry was told lessons would be learned, resilience would improve and the systems had been fixed. Ryanair said UK air traffic charges, paid by airlines, have risen 28 percent since 2022. That charge claim is the airline’s, not a regulator’s table.

Wizz Air did not name Rolfe. It went for the institution. “A critical national infrastructure provider should not repeatedly bring the aviation system to a standstill. NATS is simply not fit for purpose in its current form,” a Wizz spokesperson said.

Rolfe did not offer his resignation. Asked whether he would go, he said he would stay focused on the problem and look at the investigation afterwards. Airline consultant John Strickland put the operational point in one line: a few hours of outage can sound limited, but the impact is enormous when a substantial number of UK airports are hit at once.

WHERE EXPERTS DISAGREE

• Martin Rolfe: These events are relatively rare, safety held, and the immediate job is recovery and then an investigation.
• Neal McMahon, Ryanair: This is a pattern of repeated failure under the same chief executive, and the NATS board should appoint someone else.
• Wizz Air: The provider in its current form is not fit for purpose as critical national infrastructure.

The Civil Aviation Authority said it was in touch with NATS, expected a full report on the incident, and would then consider whether further steps were needed to secure the reliability of UK air traffic control. Other airline and airport voices, speaking privately, said they would wait to see whether Alexander backed Rolfe before joining the resignation call.

The 2023 Review Did Not End the Pattern

On 28 August 2023, NATS’s FPRSA-R flight-plan processor at Swanwick ingested a transatlantic plan it could not decode. Primary and backup both dropped into failsafe. Automated processing collapsed from roughly 800 plans an hour to about 60 done by hand. The independent review led by Jeff Halliwell, published on 14 November 2024, found that over 700,000 passengers were impacted, with a bill to industry and passengers of £75 million to £100 million.

The panel made 34 recommendations: 12 for NATS, 11 for the CAA, six for airlines and airports, and five for government, including stronger passenger protections and mandatory alternative dispute resolution. It also said the same unique set of 2023 circumstances was unlikely to recur, and that if they did, NATS’s subsequent patches should produce a different outcome.

A NATS spokesman said Tuesday’s fault was not the same as the outages in 2023 and 2025. That matters. It also does not settle the argument airlines are making, which is about recovery, not about replaying one software exception. The 2023 bug was a one-off combination of waypoints. The 2026 failure still sat in flight processing, still froze departures across the south, and still left the evening peak to be unwound by hand.

TWO PROCESSING FAILURES

NATS is a public-private partnership dating from 26 July 2001. The government holds 49 percent and a golden share, the Airline Group 42 percent, staff 5 percent and LHR Airports Limited 4 percent. In a July 2026 note, Rolfe wrote that the company now handles more than 2.5 million flights a year. Airlines sit on both sides of that structure. They help own the provider, they pay its charges, and they still pick up the hotels when the processor fails.

In the first hours, coincidence theories tried to time the outage to a government trade announcement the same afternoon. NATS’s own engineers described a flight processing fault, and the company’s later statements stayed on that point. The political fight that actually has documents behind it is older: who runs the monopoly, and why a single processor can still park the country.

What Can You Claim After a NATS Failure?

UK261 still applies to flights leaving a UK airport, on any airline. Care is not optional, and it does not depend on who caused the mess. Cash compensation is a different test, and air traffic control restrictions are the classic example of “extraordinary circumstances.”

The CAA says your airline must still provide food, drink and overnight hotels once the delay crosses the distance thresholds, plus two phone calls or emails and transport to the hotel. If staff do not hand you a voucher, keep itemised receipts and claim later. The regulator also says airlines are unlikely to treat alcohol or luxury rooms as reasonable.

CARE VERSUS CASH UNDER UK261

• Right to care: Meals and drinks after two hours on flights under 1,500 km, three hours between 1,500 km and 3,500 km, and four hours on longer sectors, whatever caused the delay.
• Overnight: A hotel and transfers if you are stuck until the next day, even when air traffic control is to blame.
• Refund choice: After five hours you can walk away from the unused flights and get your money back.
• Fixed compensation: £220, £350, or £260 to £520 per person if you arrive more than three hours late, unless the airline shows extraordinary circumstances it could not avoid.

For most people whose only problem was the NATS restriction, the cash claim will be the fight. The care claim should not be. Connecting tickets are protected as one journey. Separate self-transfer bookings are not, which is why a missed second airline on a cheap split itinerary can leave you buying a new seat.

File with the airline first. If there is no proper answer in eight weeks, the CAA’s path is an alternative dispute scheme if the carrier is signed up, or the regulator’s own passenger team if it is not.

Aircraft Stuck Overnight, Then Wednesday

Once outbound traffic stopped, inbound aircraft had nowhere to turn for the evening. Heathrow’s late arrivals were wound down. British Airways told customers with cancelled flights not to come to the airport, and said people booked on 9 September could change. Travel journalist Simon Calder said the next morning would be horrible, because aircraft that never left on Tuesday could not start inbound rotations on Wednesday.

Flightradar24 listed at least 177 cancellations on 9 September, nearly all at Heathrow. That is the second-order bill: a fault NATS said was closed at 19.30 still deleting Wednesday morning because crews and hulls were stranded. Alexander had already posted that technicians were on the job and that she was sorry passengers were being put through it. Rolfe was due in front of her the same morning, with a CAA report still to come and a Commons bill on aviation sitting on the same day’s order paper.

Passengers holding 9 September tickets still needed to check the airline app before they set off, because the processor being “normal” did not put every aircraft back on its original line.

Disclaimer: This article is news reporting on the 8 September 2026 NATS disruption and on published passenger-rights guidance. It is informational only and is not legal advice, nor a decision on any individual UK261 claim. Whether cash compensation is due turns on the facts of each booking and on whether the airline can show extraordinary circumstances, so readers should take advice from a qualified consumer-law solicitor or the airline’s approved alternative dispute body before acting. Figures, flight statuses and official statements reflect the sources available on 9 September 2026 and may change as NATS, airlines and the CAA update their accounts.