Aerial photo taken on April 28, 2018 shows staff members working on an overpass in front of the terminal of a new airport under construction in Beijing. [Photo/Xinhua]

Aerial photo taken on April 28, 2018 shows staff members working on an overpass in front of the terminal of a new airport under construction in Beijing. [Photo/Xinhua]

Aerial photo taken on April 28, 2018 shows staff members working on an overpass in front of the terminal of a new airport under construction in Beijing. [Photo/Xinhua]