September technical issue affected more than 2,000 flights, with Ryanair criticising the UK air traffic control back-up system.

More than 2,000 flights were affected after a UK air traffic control technical issue, prompting Ryanair to demand action from Nats.
Ryanair has escalated its criticism of Nats after a UK air traffic control technical issue affected more than 2,000 flights on 2026-09-11. The airline called the back-up system “useless” and demanded accountability from the UK air traffic control provider’s leadership. For passengers, the immediate concern is practical rather than political: flights may be delayed, cancelled, or rescheduled as airlines work through aircraft, crew, and slot disruptions.
The disruption was linked to a technical issue affecting Nats, the organisation responsible for managing UK air traffic control services. When air traffic control capacity is reduced or systems are affected, airlines may be forced to slow operations, hold aircraft on the ground, or change departure sequencing. Even after the original fault is addressed, disruption can continue because aircraft and crews are no longer where airlines need them to be. That is why a single airspace problem can quickly spread across multiple UK and international routes.
Ryanair’s criticism focuses on the scale of the disruption and the effectiveness of Nats’ contingency arrangements. The airline said more than 2,000 flights were affected and described the back-up system as failing passengers and carriers. While the language is unusually blunt, the underlying issue matters to travellers because airlines depend on reliable air traffic control to operate on time. If those systems falter, passengers can face missed connections, overnight delays, and uncertainty about whether their flight will operate.
The highest-risk passengers are those flying to, from, or through UK airports on tight schedules. International travellers with onward connections are especially vulnerable if their itinerary involves separate tickets, because the second airline may not be obliged to help if the first flight arrives late. Short-haul European passengers can also be affected even when their airport looks calm, as aircraft may be arriving late from previous rotations. Families, business travellers, cruise passengers, and anyone with prepaid hotels or tours should check every part of their itinerary, not just the first flight.
Before leaving home or your hotel, check your airline’s app, website, email alerts, and text messages for the most recent update. Do not rely only on airport websites or flight-tracking apps, because airlines make the final decisions on cancellation, rerouting, and check-in advice. If your flight is still shown as operating, arrive at the airport at the normal recommended time unless your airline says otherwise. If it is delayed, keep monitoring the status because departure times can move forward again when air traffic flow improves.
If your flight is cancelled, the airline should normally offer a choice between a refund or rerouting to your destination, subject to passenger rights rules. Rerouting may be on the next available service, a later date convenient to you, or potentially via an alternative routing depending on availability and the airline’s policy. If you accept a refund, the airline’s responsibility for getting you to the destination may end, so do not choose that option unless you are sure you no longer want to travel. Ask staff or customer service to confirm your choices in writing, especially if you are being told to make your own arrangements.
Air traffic control failures can fall into a different category from delays caused directly by an airline, such as crew shortages or aircraft maintenance. That means cash compensation may not be automatic, particularly if the disruption is considered outside the airline’s control. However, this does not necessarily remove the airline’s duty of care during a long delay or cancellation. Passengers should still request meals, refreshments, accommodation if required, and transport between the airport and hotel where appropriate.
Keep every receipt connected to the disruption, including food, drinks, taxis, trains, hotels, and replacement essentials. Spend reasonably, because airlines are more likely to reimburse necessary and proportionate costs than expensive upgrades or luxury meals. Take screenshots of cancellation notices, delay messages, and airport information boards showing the timing of the disruption. If you have travel insurance, contact your insurer before making large alternative bookings, as policies often require evidence and may have specific claim limits.
If your trip is urgent, look at alternative flights from nearby airports, but compare that option with the airline’s free rerouting offer first. For UK and near-European journeys, rail, coach, or ferry routes may be realistic alternatives, although availability can tighten quickly when thousands of passengers are disrupted. If you are travelling on separate tickets, contact the onward airline, hotel, tour operator, or cruise company as soon as you know you may be late. Early communication gives you the best chance of preserving bookings or avoiding no-show penalties.
The immediate passenger impact will depend on how quickly airlines recover aircraft schedules and crew positioning after the technical issue. Even where flights resume, knock-on delays can continue because aviation networks run on tight turnarounds. Travellers booked in the days immediately after the disruption should continue checking airline updates and allow more flexibility than usual. Ryanair’s demand for accountability may also increase pressure on Nats and regulators to explain what failed and how similar disruption will be prevented.
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