A failure in NATS’s flight-data processing system disrupted about 1,000 flights across the UK on September 8, 2026, with Ryanair reporting 260 cancellations affecting approximately 48,000 passengers. Chief Executive Michael O’Leary estimated immediate costs of £2.5 million to £3 million and said total losses could reach $5 million to $6 million, including passenger entitlements, accommodation and compensation. The airline expected about 30 further cancellations because crews were displaced and exceeded duty-time limits. NATS said the failure involved a defective flight plan containing duplicate airport data, resembling a 2023 breakdown. Wizz Air and Ryanair demanded reform, while the Civil Aviation Authority awaits a detailed report. Separately, Ryanair repurchased and retired 360,233 ordinary shares and ADS-linked ordinary shares between August 31 and September 4, 2026.