The Aporia · British air traffic control outage caused by software defect, says operator

On September 18, British air traffic control operator NATS announced that a recent outage affecting hundreds of thousands of passengers was caused by a software defect in its flight data system. The incident led to 2,000 flight cancellations and cost airlines millions of pounds. Transport minister Heidi Alexander criticized the disruption as "completely unacceptable" and called for an independent review by the Civil Aviation Authority to understand why the issue went undetected. NATS CEO Martin Rolfe stated that safety was never compromised during the outage and that a permanent fix is being tested and will be deployed soon.

Written by AI on 2026-09-18, from this article's own text only (the story summary below draws on all the coverage).

Story summary

The UK's National Air Traffic Services (NATS) caused over 2,000 flight cancellations and widespread disruption across British airports on September 8, 2026, due to a millisecond software defect. The glitch affected hundreds of thousands of passengers and led to an estimated loss of millions for airlines as they refunded customers and rescheduled flights. This incident follows two previous major outages in the UK since summer 2023, increasing pressure on NATS CEO Martin Rolfe who faces calls to resign. Airlines like Ryanair are demanding action from regulators, while transport minister Heidi Alexander ordered an independent review by the Civil Aviation Authority (CAA) to investigate the issue further.

Written for “Air Traffic Control Software Glitch Causes Chaos” on 2026-10-31, grounded in this article and the 23 other(s) covering the same event.

This article reads unscored and hedges 0% of its claims. Each row says how that neighbour differs.

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Evening Standard

Hedges 0 of 28 claims Outlet record 65/100

Flight disruption ‘not caused by any incorrect actions’ – report Same event

Evening Standard

Hedges 0 of 28 claims Outlet record 65/100

Air traffic chaos and compensation: 'Shutdown cost us more than £1,000' Same event

BBC News

Hedges 6 of 40 claims Outlet record 68/100

Airports chaos caused by 'software glitch' officials find - as Government orders further probe but dodges sacking under-fire NATS boss Same event

Daily Mail

Hedges 1 of 14 claims Outlet record 68/100

Flight chaos affecting hundreds of thousands caused in ‘millisecond’ by software error Same event

The Guardian

Hedges 1 of 20 claims Outlet record 66/100

Flight ‘chaos’ this month caused by ‘software defect’ – report Same event

Evening Standard

Hedges 1 of 14 claims Outlet record 65/100

Over 2,000 UK flight cancellations traced to millisecond software defect Same event

South China Morning Post

Hedges 0 of 5 claims Outlet record 64/100

Software glitch caused travel chaos, says air traffic control body Same event

BBC News

Hedges 0 of 4 claims Outlet record 68/100

Flight disruption ‘not caused by any incorrect actions’ – report Same event

Evening Standard

Hedges 0 of 24 claims Outlet record 65/100

UK air traffic controller blames a millisecond-software glitch for flight cancellations Same event

Toronto Star

Hedges 0 of 2 claims Outlet record 64/100

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The NATS report on the latest incident was triggered by a request for an identification code from an aircraft being followed by a request for a higher priority activity, pausing the first request. “Had the higher-priority request arrived even one millisecond earlier or later, the update would have completed normally,” the report said.

framing: assertive · carried by 1 article(s) · first seen 2026-09-18

🔮 The NATS report on the latest incident was triggered by a request for an identification code from an aircraft being followed by a request for a higher priority activity, pausing the first request. “Had the higher-priority request arrived even one millisecond earlier or later, the update would have completed normally,” the report said.

2026-09-18 · The Straits Times

British air traffic control outage caused by software defect, says operator · assertive framing

British air traffic control outage caused by software defect, says operator AI generated LONDON – asserted

LONDON → cause → defect

British air traffic control operator NATS said on Sept 18 an outage which affected hundreds of thousands of passengers last week was cause by a software defect. asserted

affected → say → defect

The incident led to 2,000 flight cancellations and days of disruption, costing airlines millions of pounds as they scrambled to get crews and aircraft back in place and refund passengers. asserted

they → lead → passengers

NATS chief executive Martin Rolfe said the shutdown was not related to a problem in 2023 which also caused widespread disruption, nor was it linked to military intervention – as reported by some media outlets last week. asserted

it → say → outlets

He added that safety was at no point compromised during the incident. asserted

safety → add → incident

“This was a software issue in a specific part of our flight data system, that we have traced to a small subsection of coding,” he said. asserted

he → trace → coding

“The issue has been identified and mitigation is in place while a permanent fix is safety tested and deployed.” asserted

fix → identify → place

Transport minister Heidi Alexander, who had last week demanded NATS produce a report on the matter and also ordered an independent review by the Civil Aviation Authority, said the disruption was “completely unacceptable”. asserted

disruption → demand → Authority

“We need to urgently understand why this issue was not discovered and fixed before it caused chaos,” she said in a statement. asserted

she → need → statement

The incident followed a shutdown in August 2023 which caused travel chaos, costing airlines £100 million (S$170 million). asserted

which → follow → million

A smaller technical issue which NATS was behind in July 2025 also caused 150 cancellations. asserted

NATS → cause → cancellations

Ryanair, Europe’s biggest airline, has repeatedly for Rolfe to resign since the 2023 failure asserted

Rolfe → resign → failure

report → trigger → request

British air traffic control outage caused by software defect, says operator

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