Construction crew members use basket cranes to work on an elevated area inside the terminal building at Beijing Daxing International Airport in Beijing, Friday, Oct. 26, 2018. (Photos: AP)

The airport, which is scheduled to open in 2019, will be one of the world's largest airports when it is completed, and authorities hope it will relieve congestion at Beijing's two existing commercial airports.

Construction crew members work on an elevated area inside the terminal building at Beijing Daxing International Airport in Beijing, Friday, Oct. 26, 2018.