China's new self-developed Z-20 helicopters make demonstration flight in Tianjin

Three Zhi-20 (Z-20) helicopters participate in a demo flight during the 5th China Helicopter Exposition in north China's Tianjin, Oct. 10, 2019. A fleet of China's new self-developed Z-20 helicopters has made a demonstration flight at the ongoing helicopter expo in the city of Tianjin. (Xinhua/Li Ran)