Error first occurred at 10am but major incident was not declared until 12. 30pm, says report A software defect in part of the UK’s air traffic control system corrupted flight data “in the space of a millisecond”, leading to a six-hour outage and mass airline cancellations and delays across the UK...

Source: [Guardian World](https://www.theguardian.com/world/2026/sep/18/flight-chaos-affecting-hundreds-of-thousands-caused-in-millisecond-by-software-error-uk)

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