Air travelers in the UK experienced significant disruptions as dense fog affected major airports including Heathrow, Gatwick, and Stansted. Hundreds of flights were delayed and many cancellations were reported, causing further chaos on one of the year’s busiest travel days. The air traffic control authority, NATS, announced temporary air traffic restrictions to ensure safety amid low visibility, which in some areas dropped to as little as 100 meters according to the Met Office.