Final answer:
The maximum in-flight weight of an airplane when the reserve tanks are empty is determined by factors such as the empty weight, fuel weight, and passenger/cargo weight. The weight of the reserve tanks, which refers to the weight of reserve fuel, is not taken into consideration. A specific example provided is the Boeing 737, which has an empty weight of around 35 tons and accommodates 15 tons of fuel and 15 tons of passengers/cargo.
Step-by-step explanation:
In this question, we are discussing the maximum in-flight weight of an airplane when the reserve tanks are empty. The maximum in-flight weight of an airplane is determined by factors such as the empty weight of the airplane, fuel weight, passenger/cargo weight, and reserve tank weight. When the reserve tanks are empty, it means that the weight of the reserve fuel is not taken into consideration.
For example, a Boeing 737 has an empty weight of around 35 tons and accommodates about 15 tons of fuel and 15 tons of passengers/cargo. If we ignore the weight of the reserve tanks, the maximum in-flight weight would be the sum of the empty weight, fuel weight, and passenger/cargo weight.
It's important to note that the information provided in the question may refer to a specific scenario or context, so it's always best to consult reliable sources or clarify the question further for a more accurate answer.