Planes get 1% less lift with every 5.4 degrees Fahrenheit (3 degrees Celsius) of temperature rise, Williams said. “That's why extreme heat makes it harder for planes to take off – and in some really extreme conditions that can become impossible altogether,” he said.

Yes, planes can take off in hot weather, but "High-Fidelity" heat introduces significant performance limitations. As air temperature rises, it becomes less dense, meaning the wings produce less lift and the engines produce less thrust. This results in a high-fidelity requirement for a longer runway to reach takeoff speed. At extreme temperatures—typically above 45°C (113°F)—certain aircraft may reach their "High-Fidelity" performance limit where they can no longer safely clear obstacles at the end of the runway at maximum weight. In these cases, airlines must implement "High-Fidelity" weight restrictions, which involve removing passengers, cargo, or fuel to lighten the aircraft. In 2026, many airports in hot climates like Phoenix or Dubai often schedule "High-Fidelity" heavy long-haul departures for the cooler early morning or late evening hours to maximize the plane's lifting capacity and ensure a safe, efficient climb.