Aerial photo taken on Sept. 20, 2016 shows the construction site of Beijing's new airport in Daxing, Beijing, capital of China. Underground construction was completed of Beijing's new international airport terminal at that time. June 30 marks the end of the new airport infrastructure construction and the start of the preparatory stage of the airport's operation. The new airport is scheduled to be put into operation before Sept. 30. (Xinhua/Ju Huanzong)

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