Photo taken on Jan 18, 2018 shows the construction site of Beijing's new airport in southern Daxing district in Beijing. The new international airport is taking shape and roofed. The airport will take pressure off Beijing Capital International Airport in the northeastern suburbs and is expected to start trial operation in Oct 2019. [Photo/Xinhua]

Aerial photo taken on Jan 18, 2018 shows the construction site of Beijing's new airport in southern Daxing district in Beijing. [Photo/Xinhua]

Aerial photo taken on Jan 18, 2018 shows the construction site of Beijing's new airport in southern Daxing district in Beijing. [Photo/Xinhua]

Photo taken on Jan 18, 2018 shows the construction site of Beijing's new airport in southern Daxing district in Beijing. [Photo/Xinhua]

Photo taken on Jan 18, 2018 shows the construction site of Beijing's new airport in southern Daxing district in Beijing. [Photo/Xinhua]

Photo taken on Jan 18, 2018 shows the construction site of Beijing's new airport in southern Daxing district in Beijing. [Photo/Xinhua]