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Why commercial airplanes use long, slender wings? Isn't it to maximize lift, we make the plane's wings as wide as possible?

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They need a particular amount of wing area, in order to get the desired amount of wing loading (weight per unit of area) at the speed they want to fly. Then, drag is minimized if the aspect ratio (ratio of wing length to wing width) is maximized. So at a given area, they want long narrow wings.

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