The fourth prototype of the C919, China's first domestically developed narrow-body passenger aircraft, completed its maiden flight at Pudong International Airport on Thursday morning. The No.104 C919 took off from the fourth runway at 5:32am and landed smoothly after a one-hour-25-minute test flight, the Commercial Aircraft Corporation of China said. Pilots and engineers conducted tests on the avionics system, takeoff and landing performances, automated flying and natural icing.