Army 4th China Int’l Helicopter Expo opens in Tianjin admin — September 17, 2017 add comment Editor:Li Jiayao Time:2017-09-15 China’s Fenglei aerobatic team performs at the opening ceremony of the 4th China International Helicopter Expo in Tianjin, north China, on Sept. 14, 2017. The expo kicked off here on Thursday.