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An airplane (obsolete: aeroplane; from French aéroplane, aéro – air, plane – flat) is a class of aircraft heavier than air, designed for flights in the atmosphere using a power unit that creates thrust and a wing that is stationary relative to other parts of the apparatus, creating lift. A stationary wing distinguishes an airplane from an ornithopter and a helicopter, and the presence of an engine distinguishes it from a glider and a muscle plane. An airplane differs from an airship and a balloon in that it uses an aerodynamic rather than an aerostatic method of creating lift.