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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.

After the extension, the airport can now handle up to 1 million passengers a year from 600,000 previously, said Li Hui, who is in charge of the project.

The project began in 2018 with a combined investment of 1.3 billion yuan (about 186 million U.S. dollars).