In China, construction is underway for one of the biggest airports in the world. Beijing Daxing Airport is about 42 miles south of the city center and will be accessible by high-speed train.

Passengers line up for check-in at the Beijing Daxing International Airport on Tuesday. [Photo by Luo Wangshu/chinadaily.com.cn] Beijing Daxing International Airport is expected to set new records ...