Flights across parts of the United Kingdom were disrupted on September 21 after a connectivity failure in NATS’ systems network, prompting renewed criticism from airlines over the reliability of the country’s air traffic control infrastructure. NATS said the technical issue had been fixed, although delays and cancellations continued as flight operations recovered.
The incident was the second major disruption involving NATS this month. The operator said the latest problem was unrelated to the software defect that led to approximately 2,000 flight cancellations earlier in September. That distinction separates the technical causes, but airlines argued that repeated failures raised broader concerns about resilience and backup arrangements.
EasyJet said the latest incident again called the reliability of NATS’ systems into question. Ryanair accused the operator of failing to provide either a dependable system or an effective backup. Trade body Airlines UK also criticized the disruption, saying passengers and airlines deserved better.
For travelers, the repair did not mean an immediate return to normal schedules. Airlines still needed to work through disrupted services, while passengers faced uncertainty over departure times and whether their flights would operate. British Airways warned of disruption, and easyJet canceled some services.
The latest failure adds pressure on NATS to explain how it will prevent further interruptions and improve recovery when problems occur. Airlines’ criticism focused on the recurring operational consequences rather than accepting the restoration of connectivity as the end of the issue.
Passengers traveling during the disruption should check their airline’s flight-status updates and follow instructions on airport arrival times or rebooking. A system repair announcement does not confirm that an individual flight is operating as scheduled.
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