NATS Faces Airline Fury Over Second Computer Meltdown

Airlines and passenger rights groups are condemning the UK's air traffic control operator after a second computer meltdown in less than two weeks caused significant flight disruption. The latest failure occurred early Monday at the Prestwick control centre in Scotland, affecting both Scottish and many transatlantic flights.

NATS, the privatized air traffic control provider, stated the issue was a 'connectivity issue' unrelated to a separate major system failure on September 8. While Monday's problem was resolved relatively quickly, the operator warned knock-on delays could persist throughout the day as airlines worked to recover their schedules.

Ryanair reported that 25,000 of its passengers faced delays, with over 140 flights affected. The airline's chief operations officer, Neal McMahon, demanded the resignation or dismissal of NATS chief executive Martin Rolfe. McMahon accused Rolfe of presiding over repeated system failures and a lack of effective backup. "Enough is enough," McMahon stated.

Airlines and Regulators Respond

The trade body Airlines UK, representing carriers like British Airways, Virgin Atlantic, and easyJet, echoed the criticism, saying passengers and airlines deserve better. Meanwhile, the Civil Aviation Authority (CAA), which oversees NATS, moved quickly to classify the incident. It warned passengers that it considered the meltdown an 'extraordinary circumstance.'

This classification is crucial for passenger compensation. Under UK-261 regulations, airlines are not obligated to pay financial compensation for delays caused by extraordinary circumstances. Passengers can still attempt to claim, and if rejected, can take their case to court for a final ruling.

Passenger Rights and Duties of Care

Despite the compensation exemption, airlines retain a duty of care to affected passengers. For short-haul flights delayed by at least two hours, airlines must provide meals and refreshments. Hotel accommodation is required for overnight delays. The consumer group Which? cautioned that some passengers might have to pay for these necessities upfront. It advised keeping all receipts to claim reimbursement from the airline later.

This latest failure comes just days after NATS published a preliminary report on the September 8 meltdown. That incident resulted in hundreds of cancellations and stranded tens of thousands of passengers.

Anatomy of the Previous Failure

The report detailed a complex software failure. A millisecond bug corrupted data in a flight planning system. This corruption cascaded until the system automatically severed its link with the controllers' system to prevent further damage. Controllers at the London Area Control centre then had to manage high-altitude traffic manually.

This manual process has a far lower capacity. Controllers were forced to hold departing aircraft on the ground for hours. Eventually, UK airports ran out of space for arriving flights, forcing multiple inbound planes to divert to alternative airports across Europe. NATS claimed the software bug had existed for some time but the specific conditions needed to trigger it were extremely rare. CEO Martin Rolfe said last week that 'mitigations' had been implemented to prevent a repeat and to enable faster recovery.

This is not an isolated issue for NATS. The report follows a major August 2023 failure that stranded 700,000 passengers. On that public holiday, a system struggled with an errant waypoint abbreviation and entered failsafe mode. No qualified engineers were on duty in the control room, leading to a delay of at least three hours before one could be called in to fix the error.