Passengers wait for boarding at Terminal 2 of the extended Zhangjiakou Ningyuan Airport in Zhangjiakou, north China's Hebei Province, Aug. 4, 2020. The extended Zhangjiakou Ningyuan Airport, one of the key supporting infrastructure developments for the 2022 Beijing Winter Olympics, was completed and put into service on Monday. The expansion project includes a new terminal, an emergency rescue center, an apron, and an extended runway, among others. (Photo by Wu Diansen/Xinhua)
