The UK air traffic control disruption that affected hundreds of thousands of passengers last week has been reported to be due to a software glitch. Martin Rolfe, CEO of NATS, the air traffic control system operator, stated in a statement that the issue relates to a small subset of code.
Economic Consequences of the Disruption
This disruption resulted in the cancellation of 2000 flights and several days of operational disruptions for airlines, leading to angry reactions from the airlines. These airlines incurred millions of pounds in costs to return crews and aircraft to their locations and to reimburse passengers.
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Martin Rolfe noted in a preliminary report that the issue has been identified and that measures are currently being taken to mitigate it. He also emphasized that the recent disruption was not related to issues from 2023 and posed no threat to flight safety.
Reactions from Officials and Airlines
Hailey Alexander, the Transport Secretary, has called for a report from NATS on this matter and has also ordered an independent review by the Civil Aviation Authority. She described the disruption as "completely unacceptable" and stressed the need for transparency in identifying and resolving issues.
Past disruptions have also had significant financial impacts. A disruption that occurred in August 2023 cost airlines around £100 million ($136 million). Additionally, in July 2025, another glitch in NATS due to radar issues led to 150 flight cancellations.
Ryanair, the largest airline in Europe by passenger numbers, has once again called for Martin Rolfe's resignation. Neil McMahon, Ryanair's Chief Operating Officer, has criticized the explanations provided and called for accountability and immediate action from officials.
NATS noted in its report that the recent disruption was caused by a request for an identification code from an aircraft and then a request for higher priority activity. These two requests caused the first request to be halted and ultimately led to the need for manual flight transfers and reduced operational capacity.
Given the recurrence of these issues, the need for improvement and upgrading of air traffic control infrastructure in the UK is increasingly felt to prevent such disruptions in the future.
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