2,000 UK flight cancellations caused by previously unknown defect

A NATS investigation found that a failure in the flight data processing system on September 8 caused squawk code corruption in a millisecond, leading to a national system restart and 6-hour restrictions. 2,163 flights and about 300,000 passengers were affected, with disruptions lasting more than two days.

• Failure occurred September 8 from squawk code corruption in a millisecond
• Flight restrictions lasted about 6 hours across the UK
• 2,163 flights and about 300,000 passengers affected
• CAA to conduct independent review of NATS findings