China's Zhi-20 (Z-20) helicopter made demonstration flight at the 5th China Helicopter Exposition in north China's Tianjin, October 10, 2019. /VCG Photo

The helicopters, made by the Aviation Industry Corporation of China (AVIC), debut during the recent massive National Day parade, October 1, 2019. /VCG Photo

According to Li Linhua, chief technologist of the AVIC's helicopter division, the Z-20 medium-lift helicopters with double engines are made in China. /VCG Photo

Running until October 13, the expo is held jointly by the Tianjin Municipal Government, the AVIC and the Chinese People's Liberation Army Ground Force. /VCG Photo