UK Air Traffic Control Boss Given Week to Report on 'Carnage' of Flight Cancellations

A major technical fault within the National Air Traffic Services (NATS) system led to widespread flight cancellations and severe disruption across UK airports on August 28, 2023, with significant knock-on effects continuing into the following day. The issue originated from an unusual piece of flight plan data that caused both the primary and backup flight processing systems to enter a fail-safe mode. This unprecedented system failure necessitated manual flight plan processing, drastically reducing air traffic capacity and causing extensive delays and cancellations.

The glitch stranded hundreds of thousands of passengers, with an estimated 700,000 individuals impacted by cancellations or lengthy delays. Major airports, including London Heathrow, Gatwick, Manchester, and Stansted, experienced substantial disruption. Although NATS engineers resolved the core technical problem on the afternoon of August 28, the extensive backlog of flights and displaced aircraft and crews meant that normal operations took several days to resume.

In the aftermath, the incident prompted a rigorous independent review by the Civil Aviation Authority (CAA), which identified shortcomings and proposed numerous recommendations for NATS, airlines, and airports to prevent future occurrences and improve passenger handling during such events. The widespread disruption also incurred substantial financial costs for airlines, estimated to be up to £100 million.