Millisecond Software Defect Caused UK Flight Chaos

Millisecond Software Defect Caused UK Flight Chaos

Stranded passengers with luggage sitting in an airport terminal during the UK air traffic control outage.
Passengers stranded at an airport terminal after the Sept. 8 software outage at UK air traffic control.Illustration: The Frank

The News

Britain's air traffic control operator NATS says a software defect caused the Sept. 8 outage that grounded thousands of flights, according to findings released Friday.

The National Air Traffic Services probe found the failure was "caused by a software defect in a small part of the National Airspace System (NAS)," the Daily Mail reported.

Sky News reported the investigation found the error happened in a millisecond — and was not caused by a "military operation."

The Numbers

More than 2,000 flights were cancelled and hundreds of thousands of passengers were affected, BBC News reported.

Timeline

Sept. 8, 2026

An outage hits the UK's National Airspace System, grounding thousands of flights and disrupting hundreds of thousands of passengers.

Sept. 18, 2026

NATS says the outage was caused by a software defect, Reuters reports. The Daily Mail reports the government has ordered a further probe while declining to sack the NATS boss.

Reactions

NATS said the outage that affected hundreds of thousands of passengers last week was caused by a software defect, according to Reuters.

The investigation rejected suggestions that a "military operation" was behind the failure, Sky News reported, pinning it instead on a software problem that occurred in a millisecond.

The government ordered a further investigation but stopped short of firing the under-fire head of NATS, the Daily Mail reported.

What's Next

The further government-ordered probe into the failure is still to come, per the Daily Mail, and pressure remains on NATS leadership over the airline industry's handling of the collapse.

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