People queue up to simulate check-in during a trial operation at the terminal building of the Chongqing Wushan Airport in southwest China's Chongqing Municipality, July 16, 2019. Dubbed a "high-in-the-clouds" airport, the Chongqing Wushan Airport has met industry standards Wednesday and is expected to begin operation in mid-August. (Chongqing Airport Group/Handout via Xinhua)