People visit the 2019 China International General Aviation Expo in Shijiazhuang, capital of north China's Hebei Province, Oct. 17, 2019. The 4-day expo kicked off on Thursday, featuring themes including aero science popularization and interactive experiences, unmanned aerial vehicles as well as intelligent technical equipment. (Xinhua/Liang Zidong)

People visit the 2019 China International General Aviation Expo, in Shijiazhuang, capital of north China's Hebei Province, Oct. 17, 2019. The 4-day expo kicked off on Thursday, featuring themes including aero science popularization and interactive experiences, unmanned aerial vehicles as well as intelligent technical equipment. (Xinhua/Zhao Danhui)