In late June, as the UK endured a sweltering heatwave, unexpected thunderstorms swept across southern England and northern Europe, causing significant disruptions at London’s major airports, Heathrow and Gatwick. With the holiday season in full swing, thousands of travelers found themselves stranded or delayed as air traffic controllers worked to manage the chaos. Over 900 flights were delayed, some by as much as 11 hours, and dozens were canceled. Similar issues were reported across Europe as passengers attempted to reach London, highlighting the vulnerability of air travel to sudden weather changes. Tim Atkinson, an airline risk consultant and former pilot, warns that the UK and northern Europe are particularly at risk due to the high density of air traffic. He cautions that a scenario where all of London’s airports are simultaneously affected by storms could lead to major consequences, both in the air and on the ground. "We're seeing very rapid climate change," Atkinson says, noting that the current system is designed to handle disruptions at individual airports but may not be ready for widespread simultaneous issues. Such a situation could lead to severe delays and even pose risks to passenger safety. Not all experts share Atkinson’s concerns. Andrew Charlton, a former airline executive, believes the risk is relatively low and that the industry is well-prepared to handle such situations. "You've always got to imagine the worst-case scenario," he says, but he remains confident in the industry’s ability to respond effectively. Thunderstorms are caused by convective activity, where warm, moist air rises and cools, forming large clouds. As global temperatures rise, the atmosphere can hold more moisture, increasing the likelihood of heavy rainfall. While it's unclear if the UK and Europe will see more thunderstorms, studies suggest that higher latitudes, particularly in the northern hemisphere, may experience more intense storms. Pilots generally avoid flying through convective weather, even though aircraft are built to handle severe conditions. Storms can cause turbulence and hail, which can damage planes and endanger passengers. Onboard weather radars and real-time forecasts help pilots navigate around storms, but these systems are more tactical than strategic, according to aeronautics expert Prof. Guy Gratton. This means that unplanned route changes often happen late in the flight, increasing fuel use. If storm delays become more frequent, airlines may need to carry more fuel, raising operational costs and possibly leading to higher fares for passengers. New technologies, like improved air traffic management systems, could help reduce delays. Heathrow and Gatwick have already implemented systems that calculate landing times dynamically, improving efficiency and reducing delays. Severe storms can also lead to flooding, which can disrupt airport operations. In April 2024, torrential rains at Dubai International Airport caused runway closures and the cancellation of over 1,200 flights. Even if runways are clear, passengers may still face challenges if roads and parking areas are flooded. Another climate-related threat is rising sea levels, which could flood airports located in low-lying coastal areas. New York’s LaGuardia Airport was severely affected by Hurricane Sandy in 2012, with runways under water for several days. Research indicates that 269 airports worldwide are already at risk of flooding from rising sea levels, with that number expected to grow. The cost of protecting these airports could be substantial, potentially reaching $57 billion. The aviation industry faces the challenge of reducing carbon emissions while managing the growth of air travel. Experts agree that the impacts of climate change will affect airlines, airports, and passengers alike. While mitigation strategies are crucial, some disruptions may become an unavoidable part of air travel as weather systems become more unpredictable.