Different airplanes have a different maximum operating temperature. Bombardier jets, for example, are designed to operate in temperatures of no more than 118 degrees Fahrenheit, whereas larger Airbus and Boeing jets are able to operate in temperatures of no more than about 126 degrees Fahrenheit.

In 2026, there is no single universal temperature that grounds all flights, but aircraft generally face operational limits around 48°C to 52°C (118°F to 126°F). As temperature rises, air becomes less dense, which reduces the lift generated by the wings and the thrust produced by the engines. This means planes need a much longer runway to reach takeoff speed, and sometimes the runway simply isn't long enough. For example, smaller regional jets often have a maximum operating temperature of around 118°F. At major hubs like Phoenix or Dubai, airlines may have to "offload" passengers, bags, or fuel to make the plane lighter so it can safely lift off in extreme heat. If the temperature exceeds the specific aircraft's certified limit, the plane is legally grounded because the performance charts provided by manufacturers like Boeing or Airbus do not go any higher, making the flight's safety parameters uncalculable for the pilots.