An air traffic control issue which led to more than 2,000 flights being cancelled was caused by a defect in the software that allocates codes to individual aircraft, an investigation has found.

A preliminary report into the incident on September 8 was released by the National Air Traffic Services (Nats) on Friday, who said that the issue was not caused by any “incorrect actions”.

The fault caused flights both in and out of the UK to be axed, impacting hundreds of thousands of passengers.

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