Several major UK airports, including Heathrow and Gatwick, are experiencing significant flight delays or cancellations due to a technical issue affecting the National Air Traffic Services (NATS), the organization responsible for managing air traffic across the UK. The problem, which is related to the flight processing system, has caused disruptions at airports such as Manchester, Luton, Cardiff, Exeter, Bristol, and Alicante. NATS confirmed that engineers are working to resolve the issue, but it will take time for normal operations to resume. While airspace remains open and flights are still departing, the technical problem is impacting the efficiency of flight operations. Heathrow Airport confirmed that the technical issue is affecting departing flights but not incoming ones. The airport has supported NATS in its efforts to resolve the problem and urged passengers to check with their airlines for the latest updates. Gatwick, East Midlands, and Manchester airports have also been impacted, with Manchester warning of potential delays for departing flights. Edinburgh Airport mentioned that the issue could affect its operations, while Belfast City, Birmingham, and other regional airports have also issued statements about possible disruptions. Passengers have been advised to contact their airlines directly for the most up-to-date information on their flight status. NATS has apologized for the disruption and said it will provide further updates through its website and social media platform X. On Tuesday afternoon, long delays were reported at several major airports, with flights scheduled to depart from Heathrow, Gatwick, Stansted, and London City since 2 pm either delayed or not yet taking off. Some flights have been cancelled, and Heathrow’s website listed several affected departures. British Airways reported disruptions and was in contact with its customers, while Belfast City Airport warned of possible flight changes due to the issue. Passengers affected by flight cancellations or delays may be eligible for compensation under European regulations, depending on the cause of the disruption. Airlines are required to provide meals, refreshments, and hotel accommodations if delays extend overnight. Cash compensation may be available for cancellations or delays of three hours or more, provided the issue isn't classified as "extraordinary circumstances." If flights are delayed by five hours or more, passengers may have the right to cancel their journey and claim a full refund within a week.