Convenient. The straight line (flight route) distance from Daqing City to Dongfang City in Hainan is 3404 kilometers (2 1 15 miles or 1838 nautical miles), and the whole journey takes three and a half hours, so it is very convenient to fly. An airplane is an airplane that is heavier than air. It has a power plant, one or more engines generate forward thrust or pull, and the fuselage has fixed wings to generate lift, flying in the upper, middle and lower atmosphere.