The "Thunder" aerobatic team of the Chinese People's Liberation (PLA) Army Aviation makes its debut during the 2nd China Helicopter Exposition in Tianjin, north China, Sept. 7, 2013. The air show lasted 25 minutes. (Xinhua/Yang Guang)

Pilots from the "Thunder" aerobatic team of the Chinese People's Liberation (PLA) Army Aviation pose for group photo in Tianjin, north China, Sept. 8, 2013. The team made its debut during the 2nd China Helicopter Exposition. (Xinhua/Yang Guang)

A pilot from the "Thunder" aerobatic team of the Chinese People's Liberation (PLA) Army Aviation gestures to the audience before flying during the 2nd China Helicopter Exposition in Tianjin, north China, Sept. 8, 2013. The team made its debut which lasted 25 minutes. (Xinhua/Yang Guang)

The "Thunder" aerobatic team of the Chinese People's Liberation (PLA) Army Aviation rehearses in Tianjin, north China, Sept. 3, 2013. The team made its debut during the 2nd China Helicopter Exposition. (Xinhua/Yang Guang)

The "Thunder" aerobatic team of the Chinese People's Liberation (PLA) Army Aviation makes its debut during the 2nd China Helicopter Exposition in Tianjin, north China, Sept. 6, 2013. The air show lasted 25 minutes. (Xinhua/Yang Guang)

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)

Pilots Zhu Yanjun (R, front) and Jin Jiangcheng from the "Thunder" aerobatic team of the Chinese People's Liberation (PLA) Army Aviation talk with each other 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)

The "Thunder" aerobatic team of the Chinese People's Liberation (PLA) Army Aviation makes its debut during the 2nd China Helicopter Exposition in Tianjin, north China, Sept. 6, 2013. The air show lasted 25 minutes. (Xinhua/Yang Guang)