The term "payload" in the context of aircraft refers to the weight of the cargo, passengers, and any other items that the aircraft is carrying. Fuel is not typically considered part of the payload because it is not a payload item, but rather a necessary component for the aircraft to operate.
The weight of the fuel is usually categorized separately as the "fuel load," which is the weight of the fuel needed for the flight, including any reserves required by regulations or company policy. The fuel load is not part of the payload and is instead considered a part of the aircraft's operating weight.
So, in short, aircraft payload does not include fuel.
