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San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California in the United States. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.

San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 13th most populous metropolitan statistical area in the United States with 4.6 million residents, and the fourth-largest by aggregate income and economic output, with a GDP of $669 billion in 2021. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.5 million residents, and the third-largest by economic output, with a GDP of $1.25 trillion in 2021. In the same year, San Francisco proper had a GDP of $236.4 billion, and a GDP per capita of $289,990. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.

Changzhou, a prefecture-level city under the jurisdiction of Jiangsu Province, is located in the south of Jiangsu Province and the center of the "Golden Triangle" in the lower reaches of the Yangtze River; it is bordered by the Yangtze River to the north, Taihu Lake to the east, Maoshan Mountain to the west and Tianmu Mountain to the south, and Wuxi, Suzhou and Shanghai to the north and south to Wuxi, Suzhou and Shanghai, Zhenjiang and Nanjing, Yixing and Changxing, and Jingjiang and Jiangyin. The total land area is 4375 square kilometers. Changzhou is an ancient cultural city with a history of more than 3200 years. In the late Spring and Autumn period (547 BC), the fourth season of Wu Wang Shoumeng Zafengyi Yanling began a history of more than 2500 years with accurate chronology and exact place names. Gaozu of the Western Han Dynasty was renamed Piling in the fifth year (202 BC). In the second year of Taikang, Emperor of the Western Jin Dynasty (281), Piling County was changed. Since then, all dynasties in Changzhou have been administered by counties, states, roads and governments, including Yanling, Piling, Pitan, Jinling and Changchun.
Airport In Changzhou City - Changzhou Benniu International Airport
Changzhou Benniu International Airport (Changzhou Benniu International Airport, IATA: CZX, ICAO: ZSCG), located at the junction of Xinbei District, Changzhou City, Jiangsu Province, China and Danyang City, Zhenjiang City, 18 kilometers away from Changzhou City, is a 4E-class military-civilian transport Airport.  
Changzhou Benniu International Airport was officially completed and opened for civil aviation business on March 15, 1986, named Changzhou Benniu Airport; it was renamed Changzhou Benniu International Airport on September 19, 2014; the second phase of the expansion project was completed in 1996; April 2011 The third phase of the expansion project was completed on the 28th.  
According to information on the airport's official website in October 2018, Changzhou Benniu International Airport has a terminal building, T1 (China's domestic and international Hong Kong, Macao and Taiwan), with a total area of ​​38,000 square meters; a total of 3,400 meters of runway length; apron 160,000 square meters and 20 aircraft seats; it can guarantee an annual passenger throughput of 4.9 million person-times and a cargo and mail throughput of 200,000 tons   ; As of April 2021, Changzhou Benniu International Airport will be open to 32 domestic and foreign cities in China   .
In 2019, the passenger throughput of Changzhou Benniu International Airport was 4.0523 million, a year-on-year increase of 21.8%; the cargo and mail throughput was 33,100 tons, a year-on-year increase of 17.7%; the number of takeoffs and landings was 55,400, a year-on-year increase of 21.4%; 50th, 45th, 57th.  
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