Propellers of a Y-9 transport aircraft keep spinning as a Y-9 transport aircraft attached to the PLA Air Force conduct the flight training starting from a military airfield in western China to a designated training area at an island near waters of the South China Sea in late November, 2017. This is the first time for the Chinese homemade medium-sized transport aircraft to conduct long-distance training exercise, marking the formation of combat effectiveness of the PLA Air Force's Y-9 transport aircraft. (Photo/eng.chinamil.com.cn)
