The new airport is better than ever. Beijing-Daxing International Airport is the largest single building in the world. For traveling from Beijing Daxing Airport to the center of Beijing, there is an express train service that takes approximately 20 minutes.

At the Approximately 50 foreign airlines are preparing to relocate their base from Beijing Airport to Beijing Daxing, including British Airways, Air, and Cathay Pacific, and it is expected that all airlines will change routes to Beijing Daxing entirely by the end of 2021.
Credit Travelnews