Second NATS Failure in Two Weeks Disrupts Flights in Northern UK
NATS suffered its second technical failure in under two weeks on 21 September 2026, disrupting flights in parts of the United Kingdom. The fault was reported at its control centre at Prestwick in Scotland. The Guardian
The scope was regional. Flights arriving and departing at Scottish airports were severely delayed, with disruption across Scotland, Northern Ireland and northern England. NATS, which manages UK air traffic control, said airports south of Manchester were broadly unaffected, while flights heading north and flights departing Scottish airports faced some delay. The Prestwick centre handles air traffic across Scotland and the north of England.
Airlines felt the effects quickly. British Airways and easyJet reported immediate cancellations linked to the Prestwick issue. Analysts Cirium counted 24 flights cancelled across UK airports at the time of reporting. That figure was preliminary, with delays continuing through the morning operation.
NATS said its engineers were continuing to investigate the issue at Prestwick. It also said the Prestwick issue was unrelated to the failure two weeks earlier. That distinction rests for now on the operator's account alone.
The earlier failure was larger and national in reach. On 8 September 2026, an issue with NATS' flight processing system, the computer system that handles flight plans, affected major airports across the UK. BBC NATS said the system issue was resolved, that it was operating normally and working to clear the backlog of flights. The disruption lasted for days. Nearly 2,000 flights were cancelled, and NATS later attributed that outage to a software defect. Reuters
After the 8 September outage, the UK government gave NATS a week to investigate the systems failure that halted flights. Reuters The Prestwick incident came less than two weeks after that major incident at NATS's control centre in England, which disrupted travel for hundreds of thousands of passengers.
The broader context here is about assurance under pressure. Two failures in quick succession, even if technically distinct and different in scale, change the questions facing an air navigation service provider. Operators, airports and regulators will want to know not only what failed at Prestwick, but how isolation between centres, fallback procedures and traffic flow management performed when it did. They will also read the operator's early statement that the two events are unrelated against the findings of the investigation into the 8 September software defect, which is still fresh.
In my view, what to watch next is narrow and practical. The Prestwick engineering investigation will determine the cause and duration of flow constraints. The earlier, government-ordered review will determine whether the software defect points to testing, procurement or system architecture issues with wider relevance. Until both report, airlines operating Scottish and north-south routes face a period of operational caution, and policymakers face renewed attention on the resilience of infrastructure the travelling public rarely notices until it stops working.
