What does OAT stand for in aviation?

The term OAT stands for Outside Air Temperature in aviation. This measurement is crucial for various operational aspects, including flight performance calculations and aircraft systems management. The OAT affects engine performance, lift, and overall aircraft efficiency. Pilots and flight planners rely on this data to ensure safe and efficient flights, as temperature can significantly influence air density and, consequently, the lift generated by the wings and the performance of the engines.

While the other options suggest plausible aviation concepts, they do not accurately reflect the standard abbreviation used in the industry. For example, the term "Operating air temperature" is not commonly used in aviation, and "Optimal air temperature" is subjective and varies with different flight conditions or aircraft types. "Overhead air temperature" does not align with standard aviation terminology either, making Outside Air Temperature the clear and correct interpretation of OAT in this context.