Software fault corrupted flight data in the space of a millisecond, causing a six-hour outage that left airlines cancelling services and passengers facing widespread disruption across the UK, National Air Traffic Services (NATS) has reported. The organisation says the error first occurred at about 10:00 BST, although a major-incident status was not declared until 12:30 BST. The disruption affected operations across parts of the country’s air traffic control network.
NATS attributed the failure to a defect in a component of the control system that corrupted information used to manage flights. The rapid corruption — described by the organisation as occurring in a millisecond — produced cascading operational problems that required systems to be taken offline while operators worked to restore a safe and stable environment. For official details from the service provider, see National Air Traffic Services.
The incident prompted the cancellation of numerous flights and widespread delays, affecting what industry sources describe as hundreds of thousands of passengers. UK ministers said the NATS report left important questions unanswered and urged an urgent explanation of why the fault had not been detected and corrected before producing significant disruption. The Department for Transport has been named among the government bodies engaged in scrutinising the episode; further statements are expected from authorities in the coming days. See Department for Transport for institutional context.
The episode has focused attention on the resilience of systems underpinning the country’s aviation sector and the speed at which software faults can translate into operational crises. Industry observers note the potential ramifications for contingency planning, system testing and oversight across aviation services. For passengers and airlines, the immediate concern is recovery of normal schedules and clarity about measures to prevent a recurrence, while regulators and the service provider work through the technical and procedural findings set out in the report.