UK air traffic control software glitch causes major flight disruptions

On September 8, 2026, the United Kingdom experienced widespread flight disruptions caused by a significant software failure within the National Air Traffic Services (Nats) system. The incident resulted in a six-hour operational outage that forced the cancellation of 2,000 flights and affected the travel plans of hundreds of thousands of passengers across the country.

The preliminary report from Nats indicates that the failure occurred within the National Airspace System, which is responsible for assigning identification codes to aircraft for radar detection. The glitch was triggered when a manual request for an aircraft code was interrupted by a second simultaneous request. Upon system restart, the software failed to process the data correctly, leading to the corruption of flight information. While the initial impact was localized to departures from London, the system failure quickly expanded to encompass flights across the entire UK and beyond.

Authorities are currently working to address the underlying software issues to restore full stability and prevent similar systemic failures in the future. The incident serves as a critical technical review point for the national infrastructure involved in managing air traffic.