By Benson Daniel
A military aircraft’s flight data has reportedly been identified as the trigger for the major air traffic control outage that disrupted flights across the United Kingdom earlier this week, grounding thousands of aircraft and leaving hundreds of thousands of passengers affected.
The incident occurred on Tuesday when the flight processing system operated by the UK’s National Air Traffic Services (NATS) suffered a major failure. The system was shut down for several hours, forcing airports to suspend departures and causing widespread delays, cancellations and diversions. More than 2,000 flights were reportedly cancelled as the disruption continued to affect operations.
Reports emerging on Friday indicated that a flight plan submitted by a UK military aircraft had entered what was described as “spurious” data into the system. The data reportedly triggered a chain of failures that caused the flight processing system to malfunction.
However, the precise cause has not yet been officially established. The Ministry of Defence has said there is currently no indication that the military made an error, while the NATS investigation remains ongoing.
The outage exposed concerns about the resilience of Britain’s air traffic infrastructure. The affected flight processing system does not currently have a dedicated backup, with NATS undergoing a wider overhaul of its technology infrastructure.
The disruption quickly spread across major UK airports, with aircraft unable to depart and incoming flights diverted to airports outside the country. Some passengers experienced delays of several hours, while airlines were forced to cancel services to prevent schedules from becoming even more severely disrupted.
The incident has also increased pressure on NATS chief executive Martin Rolfe. Airlines have criticised the organisation’s handling of the crisis and questioned why safeguards introduced after a major air traffic disruption in 2023 did not prevent a similar breakdown.
UK Transport Secretary Heidi Alexander has demanded a report from NATS on the cause of the outage within a week, while the Civil Aviation Authority is conducting an independent review.
The latest disruption is particularly embarrassing for the UK aviation sector because authorities had previously promised improvements following the 2023 incident, which also involved problems with flight-plan data.
Although the immediate technical problem has been resolved, airlines have warned that the consequences could continue as operators work to clear the backlog of aircraft, passengers and crews created by the shutdown.
Investigators will now have to determine exactly how the flight data interacted with the NATS system and why existing safeguards failed to contain the problem.
Until the investigations are completed, the military aircraft’s role remains a reported trigger rather than a confirmed final cause of the outage.
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