A technical failure at UK air traffic control provider NATS disrupted flights across major British airports on September 8, 2026. NATS says the affected flight-data processing system is fixed and operating normally, but airlines and airports are still clearing a backlog that can cause cancellations, missed connections and aircraft-positioning problems after the original fault has ended.
Flight-tracking service Flightradar24 counted about 1,300 cancelled flights to and from UK airports on Tuesday. It also recorded another 177 cancellations for Wednesday, almost all at Heathrow. Those figures may be revised as schedules are updated, so passengers should check their own flight rather than assuming every service at an affected airport has been cancelled.
Is the UK air traffic control problem fixed?
NATS said at 18:34 GMT on September 8 that the technical issue had been resolved. The provider said safety was not compromised and that it was operating normally while working to clear the remaining flights.
That statement is important, but a repaired system does not instantly restore the timetable. Aircraft may be in the wrong city, crews can reach legal duty-time limits and airport stands may still be occupied by delayed planes. A flight scheduled hours after the repair can therefore be cancelled or retimed because of the earlier disruption.
NATS chief executive Martin Rolfe told Sky News that the organisation had not completed its investigation and did not yet know exactly what caused the failure. There was no confirmed public finding in the initial report that established a cyberattack or malicious activity. Claims about the cause should be treated as unverified until NATS or the Civil Aviation Authority publishes evidence.
Which UK airports and airlines were affected?
Heathrow, Gatwick, Manchester and Stansted were among the airports affected by restrictions and delays. Reuters also cited disruption data covering London City, Luton, Edinburgh and Bristol.
Heathrow suspended arrivals for the remainder of Tuesday after the fault, while departures later resumed. British Airways, the largest airline at Heathrow, warned of a significant knock-on effect. Cirium data cited by Reuters showed that BA cancelled 16 of its 333 scheduled departures from Heathrow during the disruption.
Ryanair said around 150,000 of its passengers were affected by delays of up to eight hours and that it cancelled more than 200 flights. Wizz Air also reported disruption and joined Ryanair in demanding changes at NATS. Those statements reflect the airlines' positions; the investigation will determine what failed and whether further regulatory action is required.
What passengers should do before travelling
The operating airline is the best source for an individual booking. Check its app or website using the flight number, confirm the departure airport and terminal, and look again before leaving for the airport. An airport-wide notice may describe general conditions without showing the latest decision for a specific service.
Passengers should keep booking confirmations, boarding passes, delay notifications and receipts for reasonable food, transport or accommodation costs. Do not cancel a booking yourself merely because the airport appears busy unless the airline advises it or the ticket conditions make the consequences clear. A voluntary cancellation can affect rebooking or refund options.
If a journey includes a connection, check whether all sectors are on one booking. When flights are issued under a single itinerary, the airline normally has more responsibility for rerouting a missed connection than when travellers bought separate tickets. Travel insurance may help with costs not covered by the carrier, but policy exclusions and required evidence vary.
The recovery pattern is similar to other network-wide disruptions: operations can resume while individual flights remain affected. Our report on the Kenya airport strike recovery explains why crews and aircraft take time to return to schedule. Travellers can also use the practical checks in our Jakarta volcanic-ash flight guide.
Can passengers claim compensation?
Eligibility depends on the route, carrier, length of delay and the reason for the disruption. UK passenger-rights rules can require airlines to provide care such as meals, communication and accommodation during qualifying delays. A refund or alternative journey may also be available when a flight is cancelled.
Cash compensation is a separate question. Airlines may argue that an external air traffic control failure is an extraordinary circumstance outside their control, which can affect compensation eligibility. That does not automatically remove every duty to assist, refund or reroute passengers.
Travellers should request the airline's written reason for the cancellation and use the carrier's official claims process. If the response is rejected, the next route may involve an approved alternative-dispute-resolution body or the relevant aviation regulator. This article is general information, not legal advice, and rights can differ for flights outside the UK framework.
Why a short technical outage causes widespread delays
Air traffic control manages aircraft through limited sections of busy airspace. When processing capacity falls, fewer flights can be safely accepted. Airlines then hold aircraft on the ground, delay departures or cancel services to prevent congestion from exceeding the available capacity.
European airline schedules are tightly connected. One aircraft may fly several routes in a day, and its crew may operate multiple sectors. A delay in London can therefore affect a later flight in another country even if the second airport had no technical problem.
This network effect explains why recovery can take longer than the outage itself. NATS described the process as complex and said the event created difficulties across the aviation network. The operational priority is safe sequencing, not immediately restoring every departure in its original order.
Investigation and calls for NATS reform
The UK Civil Aviation Authority has asked NATS for a full incident report and will consider whether more steps are needed to protect system reliability. The scrutiny follows earlier failures, including a 2023 flight-plan processing problem and a radar-related issue in 2025.
Ryanair called for Rolfe to resign, while Wizz Air said urgent reform was required. NATS apologised and said it was working with airports and airlines on the recovery. The regulator's report will be more useful than competing public statements for establishing the technical cause, the effectiveness of backup systems and any required corrective action.
What to watch next
Passengers should watch three signals: their airline's live flight status, Heathrow and other airport operating notices, and any formal update from NATS. The cancellation total is useful for understanding scale, but it cannot predict the status of one future flight.
For the longer-term story, the CAA investigation should establish why the flight-data processing system failed, how quickly contingency procedures worked and whether infrastructure changes are necessary. Until that report is available, it is accurate to say the system has been restored but the cause remains under investigation.
Source: Reuters report on the UK air traffic control disruption.
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