NATS says software defect caused UK air traffic outage and mass flight cancellations

The UK's National Air Traffic Services has said a software defect caused the air traffic control outage that disrupted flights earlier this month. The failure led to more than 2,000 cancellations and affected hundreds of thousands of passengers. Flights in and out of major airports, including Heathrow, Gatwick, Luton and Glasgow, were among those hit.

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In its initial report, NATS said the defect occurred in the system that underpins the management of UK airspace. It said the problem happened in the space of a millisecond and caused corrupted data to be produced. With controllers left with reduced information, restrictions were introduced to limit air traffic in order to maintain safety.

The disruption left some passengers sleeping on airport floors or stranded overseas, underlining the scale of the impact on one of Europe's busiest aviation networks. The incident also raised questions about the resilience of NATS systems and prompted scrutiny of the organisation's leadership. Some airlines questioned the position of chief executive Martin Rolfe after the outage.

The cause matters because the UK's air traffic system is central to the movement of domestic and international flights across the country. Any failure in that network can quickly spread across airports and airlines, affecting schedules far beyond the point of origin. The fact that the outage was not linked to a cyber attack, according to the government, narrows the focus to technical reliability and system safeguards.

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The episode also follows earlier public speculation about what triggered the disruption. The government had already ruled out a cyber attack, while the Ministry of Defence denied a report that a military aircraft was to blame. NATS' explanation now points to a software fault inside the system itself, rather than an external interference event.

What remains unclear is whether further changes will be made to the system or whether any wider operational review will follow. It is also not yet clear what, if any, consequences there will be for senior management or for airlines affected by the cancellations. The key issue now is whether NATS can demonstrate that the failure was isolated and that similar disruption can be prevented in future.

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