Thunderstorms over southern England disrupt flights at London’s Heathrow and Gatwick, causing hundreds of delays and some cancellations. Multiple outlets report that nearly 800 flights are affected, with flight-tracking data cited for the number of arrivals and departures delayed or impacted at each airport. Air traffic control and European aviation officials indicate aircraft must avoid a broad area of hot, unstable air, with conditions expected to persist for much of the day and create uncertainty about where the worst weather will develop next. Some passengers experience extended waits, including being stuck on the ground in hot conditions following a run of earlier extreme temperatures. Reports also describe lightning-related damage in areas near the airports, including a damaged home in Crawley and fire damage to a property roof in Streatham. While storms move on, airlines and aviation authorities warn that disruption may continue into Sunday as schedules recover. Overall, the sources consistently attribute the travel disruption to safety restrictions and turbulent weather caused by thunderstorms.