What is one benefit of flying at high altitudes?

Flying at high altitudes offers several advantages, and one significant benefit is optimal engine fuel efficiency. As an aircraft ascends, the air becomes less dense, which reduces drag on the airframe. This lower drag allows the engines to operate more efficiently. At high altitudes, engines are able to utilize their thrust more effectively, leading to lower fuel consumption for a given amount of power, thereby enhancing the overall fuel efficiency of the aircraft.

Additionally, flying high can contribute to smoother rides, as the turbulence often experienced at lower altitudes is less pronounced. Overall, these factors combined make high-altitude flight beneficial for both fuel efficiency and operational performance. This is why flying at higher altitudes is preferred for long-haul commercial flights, contributing significantly to the airline's operational cost-effectiveness and environmental sustainability.