The Guardian reported a military aircraft flight plan may have triggered the NATS outage.
Why it matters: The outage disrupted more than 2,000 flights and raised fresh questions about UK air traffic resilience. An independent review is now underway, with the cause still not publicly confirmed by officials.
- The outage began Sept. 8, when NATS suffered a technical failure in its flight processing system.
- The Guardian reported Sept. 12 that four people briefed on the incident linked the shutdown to a UK military aircraft flight plan.
- More than 2,000 flights were cancelled or affected, according to reporting citing Cirium data.
- The Civil Aviation Authority has ordered an independent review of the disruption and NATS' resilience.
The latest reporting points to a possible trigger for the UK air traffic outage, but the allegation has not been confirmed by officials. The Guardian reported on Sept. 12 that four people briefed on the incident linked the shutdown to a UK military aircraft flight plan. Separate reporting from the Financial Times said anomalous or spurious flight data may have set off the disruption.
The outage began on Sept. 8 and disrupted departures and arrivals at major UK airports, including Heathrow and Gatwick. NATS said the issue was a technical fault in its flight data processing system and later said it had been resolved.
The Civil Aviation Authority said on Sept. 9 that the government asked it to carry out an independent review to establish what happened and assess NATS' preparedness for future resilience. The regulator also said disruption directly caused by the outage is likely to be treated as extraordinary circumstances under passenger rights rules, which would make compensation claims unlikely in many cases.
For now, the military-flight-plan link remains a reported allegation, not a public finding. The independent review is the next official step.
By the numbers
- Sept. 8 - Date the outage began.
- More than 2,000 flights - Flights cancelled or affected, according to Cirium-cited reporting.
- Sept. 9 - Date the CAA said the government ordered an independent review.
Yes, but: The trigger remains unconfirmed by NATS, the CAA or government officials, and the exact failure mode has not been publicly identified.
What's next: Watch for the CAA's independent review, which is expected to examine what caused the flight-data failure and whether NATS was prepared to handle it.