Thousands of flights into and out of British airports faced cancellations and significant delays on Tuesday and Wednesday following a major technical failure within the National Air Traffic Services (NATS) flight processing system. The disruption impacted major hubs including Heathrow, Gatwick, Manchester, and Birmingham, with ongoing effects into Wednesday morning.

As of Wednesday morning, FlightRadar reported 246 cancellations at Heathrow and 33 at Gatwick. The chaos has led to "nightmare" journeys for many travelers attempting to return home. One passenger, Mark Houghton, described his experience after his flight from Barcelona was initially canceled, followed by a five-hour delay on a rebooked flight to Gatwick, ultimately arriving home at 3:30 a.m. Another traveler, Louise Jarvis, reported a group of eight stranded at Gatwick for 16 hours due to two successive flight cancellations, resulting in the loss of two days of their holiday. Passengers were left to rebook flights and navigate the disruptions independently.

Sarah Holt detailed her experience of a canceled flight from Lisbon to Heathrow, which led to an overnight stay in Portugal at her own expense, with her airline rebooking her on a flight not until Thursday. She noted extensive queues at Lisbon airport due to cancellations and missed two days of paid work.

According to consumer advice organizations, passengers affected by the NATS technical failure are unlikely to receive direct compensation from their airlines. Rory Boland, editor of Which? Travel, stated that such technical issues are typically considered "extraordinary circumstances" beyond the airline's control, thus negating compensation claims. However, passengers may be entitled to food and accommodation depending on the length of the delay, provided they retain receipts for reimbursement. Alicia Hempsted, a travel insurance expert, echoed this, emphasizing that technical air traffic control issues rarely qualify for airline fault-based compensation. Travel insurance policies, depending on their terms, might cover disruption or financial losses, but policyholders are advised to check their specific coverage.

Luke Petherbridge, director of public affairs at ABTA, highlighted that customer rights vary based on booking methods (separate flights versus package holidays) and assured that ABTA members would assist affected travelers. He also indicated that the industry and public would seek answers regarding the failure and measures to enhance system resilience, noting this is not the first NATS outage to cause significant disruption.

Martin Rolfe, CEO of NATS, has committed to a "very, very thorough investigation" into the incident, ruling out a cyber attack as the cause. He apologized for the disruption, acknowledging that while complex systems can experience failures, NATS aims to manage them properly. Rolfe affirmed the UK's strong reputation for air traffic control safety and resilience, mentioning substantial investments in technology since NATS' partial privatization 25 years ago.

Flights have since resumed at Gatwick and Heathrow, but airlines are advising passengers to check their flight status directly and expect residual disruption as aircraft and crew are repositioned. Passengers are urged to only travel to the airport if their flight is confirmed.