Chinese Helicopter Gunships practise taking-off for the coming China Helicopter Exposition at a helicopter base of Aviation Industry Corporation of China in the Airport Area of China Pilot Free Trade Zone of Tianjin, north China, Sept. 7, 2015. The exposition will be opened on Sept. 9. (Xinhua/Wang Huan)
Chinese Helicopter Gunships perform at the opening ceremony of the Tianjin International Helicopter Exhibition in a helicopter base of Aviation Industry Corporation of China in the Airport Area of China Pilot Free Trade Zone of Tianjin, north China, north China, Sept. 9, 2015. The exhibition displayed 56 helicopters and attracted 366 enterprises. (Xinhua/Zhang Chenlin)
Chinese Air Force pilots prepare to fly a Su-30 fighter to the West Pacific, via the Bashi Strait, for a routine combat simulation drill Sept. 12, 2016. The Chinese Air Force on Monday sent multiple aircraft models, including H-6K bombers, Su-30 fighters, and air tankers, for the drill. The fleet conducted reconnaissance and early warning, sea surface cruising, inflight refueling, and achieved all the drill's targets. (Xinhua/Jin Danhua)
A Chinese Air Force Su-30 fighter is refueled during a routine combat simulation drill over the West Pacific Sept. 12, 2016.(Xinhua/Xiao Jianjun)
Two Chinese Air Force Su-30 fighters fly to the West Pacific, via the Bashi Strait, for a routine combat simulation drill, Sept. 12, 2016.
A Chinese Air Force H-6K bomber flies to the West Pacific, via the Bashi Strait, for a routine combat simulation drill, Sept. 12, 2016.
A Chinese Air Force J-11 fighter flies to the West Pacific, via the Bashi Strait, for a routine combat simulation drill, Sept. 12, 2016.