 In 1923, Harris became the first pilot to fly the massive Barling Bomber, then the world's largest aircraft.Harris and his co-pilot, Lt. Muir Fairchild, would be virtually the only pilots to fly the enormous aircraft during its brief operational career.On February 23, 1924, Harris became one of the first pilots to fly the Emile Berliner Helicopter, the U.S. Air Service's first experimental helicopter.