The National Air Traffic Services (Nats) experienced a major operational failure earlier in the week when its systems shut down for four hours, resulting in the cancellation of more than 2,000 flights and disrupting the travel plans of hundreds of thousands of passengers across the UK.
According to reporting by the Financial Times, sources briefed on the incident attributed the shutdown to erroneous flight plan data submitted by a UK military aircraft, which reportedly overwhelmed the air traffic control systems maintained by Nats. The disruption persisted for several hours before resolution. During the crisis, Nats operations officer Kathryn Leahy communicated with airport and airline managers, during which it emerged that the organization lacked a dedicated backup system for its flight processing capabilities. This gap in redundancy was attributed to Nats undergoing a comprehensive system overhaul, with officials citing the prohibitive cost of duplicating the volume of data maintained by the organization.
The incident has intensified scrutiny of Nats leadership. Transport Secretary Heidi Alexander summoned chief executive Martin Rolfe to a meeting on Wednesday and tasked him with delivering a report on the causes within one week. Alexander stated her view that the disruption was avoidable. Separately, the Civil Aviation Authority was commissioned to conduct an independent review of the incident. Rolfe denied that a cyber-attack was responsible, characterizing the event as unprecedented in the organization’s operational history.
The outage represents the most significant disruption to British airspace since August 2023, when a technical malfunction caused nearly 1,600 flight delays. Following that earlier incident, the Civil Aviation Authority had issued 34 recommendations for system improvements, all of which were reportedly completed. Multiple airlines have called for Rolfe’s removal, with Ryanair’s chief executive characterizing his position as untenable and criticizing his public statements. The Ministry of Defence stated that it found no evidence of error on the part of the military and declined further comment pending completion of the Nats investigation.
Affected passengers faced prolonged uncertainty, with some remaining on aircraft for more than four hours without information. Flights scheduled to arrive in the UK were diverted to alternative airports, with some diverted to Germany. Despite the scale of the disruption, passengers were unlikely to be eligible for compensation, as the delays qualified as extraordinary circumstances under aviation regulations.
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