PLA's 'Thunder' aerobatic team debuts at China Helicopter Expo (6/8)

Pilots Li Kuiyuan (R) and Bai Yunfei from the "Thunder" aerobatic team of the Chinese People's Liberation (PLA) Army Aviation celebrate after an air show in Tianjin, north China, Sept. 8, 2013. The team made its debut during the 2nd China Helicopter Exposition. (Xinhua/Yang Guang)