A monoplane is an aircraft design characterized by having a single main wing. This type of airplane is distinct from biplanes, which have two wings stacked one above the other. Monoplanes are popular in modern aviation due to their efficiency and aerodynamic advantages, allowing for faster speeds and better fuel economy. The structure of a monoplane typically includes a fuselage, wings, and a tail. Many famous aircraft, such as the Boeing 747 and the Cessna 172, are monoplane designs. The simplicity of having one wing also makes monoplane construction and maintenance easier compared to more complex designs.