Extreme heat is becoming an increasingly significant challenge for air travel, with rising temperatures potentially disrupting flights and causing delays. This issue is particularly relevant for airports in desert climates, but it also affects those at higher elevations or with shorter runways. The problem is exacerbated by human-caused climate change, which is expected to make such disruptions more common. As temperatures soar, aircraft may need to be lightened by removing passengers or cargo, or carrying less fuel to ensure safe takeoff. This is due to the physics of flight, where hot air is thinner, making it harder for planes to generate lift and thrust. The situation is akin to athletes competing at high altitude, where thinner air can lead to fatigue. The Federal Aviation Administration does not set a single maximum temperature for takeoff, but rather, operating limits vary based on the aircraft's make and model, weight, and the airport's altitude. A 2017 study projected that some airports could see weight restrictions on 10-30% of flights during the hottest part of the day by mid-century if greenhouse gas emissions continued to rise. More recent studies indicate that planes taking off from European airports will have to shed the weight equivalent of 10 passengers per flight by 2065. The frequency of such hot days is increasing in cities like Phoenix and Las Vegas, with Phoenix Sky Harbor International Airport averaging 43 days with temperatures over 110F since 2020, and Harry Reid International Airport in Las Vegas seeing a similar increase. This trend is also evident at Palm Springs International Airport, where the number of days with temperatures over 110F has surged by 83% since the 2000s. Airlines have had to deal with these issues for years, canceling flights and asking for volunteers to step off planes due to weight restrictions. The urban heat island effect, where built-up areas become hotter than their surroundings, further exacerbates the problem at airports. As temperatures continue to rise, the impact on air travel is likely to intensify, requiring innovative solutions to ensure safe and efficient operations.
