​Air travel across the United Kingdom came to a near-standstill following a major technical failure in the flight processing systems managed by National Air Traffic Services (NATS). The outage triggered widespread ground stops, massive flight delays, and cancellations across major hubs, including London Heathrow, London Gatwick, and East Midlands Airport.

What Caused the Groundings?

​According to NATS, an unexpected technical glitch within its flight processing system forced air traffic controllers to manually throttle departing traffic to maintain safety standards.
​While social media speculation and passenger accounts initially pointed toward a potential cyberattack, NATS explicitly clarified that there is currently no evidence suggesting malicious activity. Engineers were deployed to resolve the core system malfunction, but operational recovery is expected to take time as backlogs clear across UK airspace.
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Impact Across Key Airports

​London Heathrow
​As the UK’s busiest international hub, Heathrow experienced widespread delays and groundings. While incoming international arrivals were allowed to land safely, hundreds of departing flights were held on taxiways or kept at gates, causing severe knock-on delays across European and transatlantic routes.
​London Gatwick
​Ground operations at Gatwick were similarly suspended for departing aircraft. Terminal halls rapidly overcrowded as airlines urged passengers to clear security check-in while awaiting updates from NATS engineers.