The Wright brothers completed their first full circle in an airplane in 1904.
The achievement occurred during testing of the Wright Flyer II at Huffman Prairie, near Dayton, Ohio. On September 20, 1904, Wilbur Wright flew the aircraft in a complete circle, demonstrating a level of control that went beyond simply flying straight and landing. Turning was a major challenge because an aircraft had to coordinate roll and yaw while maintaining lift.
The brothers’ wing-warping system, combined with their movable rudder, allowed them to control the airplane around three axes. Their first circle was a crucial step toward practical flight, even though the Flyer II still had limitations and often required a launching catapult.
The event is sometimes confused with the 1905 season, when the Wright Flyer III made much longer and more dependable flights. In 1904, the brothers were still refining the basic control and launching techniques that made those later flights possible.