The Canadian Snowbirds fly over the Golden Gate Bridge in an air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Wu Xiaoling)
The U.S. Navy Blue Angels fly over the Golden Gate Bridge in an air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Liu Yilin)
The U.S. Navy Blue Angels fly over the Golden Gate Bridge in an air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Liu Yilin)
The U.S. Navy Blue Angels fly over the Golden Gate Bridge in an air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Liu Yilin)
A girl watches the air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Wu Xiaoling)
A girl watches the air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Wu Xiaoling)
Aerobatics aircraft perform in an air show of the annual Fleet Week activities in San Francisco, the United States, on Oct. 7, 2017. (Xinhua/Wu Xiaoling)
