On Monday a connectivity issue at the National Air Traffic Services (NATS) control centre in Prestwick triggered a cascade of flight disruptions across the north of the United Kingdom. The problem, described by NATS as a "connectivity issue," was unrelated to a software defect that had affected the Swanwick centre earlier in the month.
Background
The Prestwick outage impacted traffic in Scotland, Northern Ireland and northern England – roughly 42% of the UK’s air traffic. NATS reported that the underlying issue had been resolved and that the system was operating at "full capacity," but warned of knock‑on effects as airlines worked to recover residual delays.
- More than 150 flights were cancelled on the day, including 140 departures and 137 arrivals (Cirium data).
- EasyJet suffered the greatest impact, with 48 of its 670 scheduled departures cancelled.
- British Airways reported 13 cancellations out of 513 scheduled flights.
Airlines' Response
Airlines quickly attributed the disruption to the ATC glitch and called for stronger safeguards.
EasyJet said the incident "once again calls into question the resilience" of the service. Wizz Air described the situation as a "national confidence crisis" in NATS and urged "urgent reform" of the organisation. Ryanair reiterated its demand that NATS chief Martin Rolfe resign, arguing that he had failed to deliver "either a reliable system or an effective back‑up".
Industry bodies echoed these concerns. Airlines UK stated that both passengers and airlines "deserve better" after "yet another NATS failure," while Jet2’s chief executive called for "urgent and accountable" action to bolster the ATC infrastructure.
Regulatory and Operational Impact
The UK Civil Aviation Authority (CAA) indicated that passengers affected by the disruption are "unlikely" to receive compensation, classifying the technical issue as "extraordinary circumstances" under passenger‑rights rules. An independent CAA review of the ATC system’s resilience is underway, with findings to be published within six months.
Transport Secretary Heidi Alexander described the situation as "deeply frustrating" for travellers, and Prime Minister Andy Burnham warned that repeated incidents "cause even greater concern" about the UK's air traffic control. Burnham said the matter would be investigated thoroughly, though he stopped short of calling for the removal of NATS leadership.
Uncertainty
While NATS has confirmed that the Prestwick connectivity problem has been fixed, the precise technical cause remains undisclosed. The report on the earlier Swanwick software defect noted that the error occurred "in the space of a millisecond" and produced corrupted data, but described the fault as "very, very obscure." Consequently, the extent to which systemic weaknesses versus isolated technical glitches contributed to the cascading delays is still under review.
Passengers continue to experience knock‑on effects as airlines re‑book affected travellers. The full operational recovery timeline and any potential policy changes to improve ATC resilience remain uncertain pending the CAA’s forthcoming review.