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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.

Changzi County, which belongs to Changzhi City, Shanxi Province, is located in the southeast of Shanxi Province and the southwest of Shangdang Basin, between 35 °53 °N and 36 °15 °N and 112 °27 °E and 113 °00'E. The total area of the county is 1029 square kilometers. Changzi County is a warm temperate continental monsoon climate, affected by the alternation of cold and warm air forces, four distinct seasons, mild climate, hot and rainy season, strong monsoon. As of 2018, Changzi County has jurisdiction over 7 towns and 5 townships, and the county government is stationed in Zhu Dan Town. As of the end of 2018, the total population of Changzi County is 366000. The eldest son of King Yao, Danzhu, was named the county because of its long history. During the Sixteen Kingdoms of the Eastern Jin Dynasty, Murong was called emperor according to his eldest son and became the capital of Xiyan. During the Sui Kai Emperor's reign, it was called the eldest son County. Since then, the name of the county has not been changed.
Airport In Zhangzi County - Changzhi Wangcun Airport
Changzhi Wangcun Airport (Changzhi Wangcun Airport, IATA: CIH; ICAO: ZBCZ), located at the junction of Luzhou District and Lucheng District, Changzhi City, Shanxi Province, China, 5.5 kilometers south of Changzhi City Center, is a 4C-level military-civilian shared domestic feeder airport   .
In 1958, Changzhi Wangcun Airport was built; in 1967, Changzhi Wangcun Airport was converted into a military-civilian airport; in June 2000, Changzhi Wangcun Airport was suspended; on September 8, 2003, Changzhi Wangcun Airport resumed operations   ; In September 2021, the new terminal of Changzhi Wangcun Airport will be opened   .
As of October 2021, the terminal building of Changzhi Wangcun Airport covers an area of ​​22,100 square meters, with 7 boarding bridges; 9 aircraft seats on the civil aviation platform, 2 of which are near the aircraft; the runway is 2,440 meters long (actually built 2,600 meters) meters) and 45 meters wide; it can meet the needs of annual passenger throughput of 1.5 million passengers and cargo and mail throughput of 4,500 tons         .
In 2021, Changzhi Wangcun Airport will handle a total of 350,012 passengers, a year-on-year decrease of 16.3%, ranking 156th in the country; cargo and mail throughput will be 123.4 tons, a year-on-year decrease of 53.4%, ranking 178th in the country; aircraft take-offs and landings will be 4,698 , down 24.1% year-on-year, ranking 166th in the country   .
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