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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.

Yunyang County is located in the northeast of Chongqing, 310 kilometers away from the nine districts of the main city of Chongqing, and is an important hub connecting the ecological economic zone of the three Gorges Reservoir area along the Yangtze River from the east to the west and from the south to the north. Yunyang County is connected with Fengjie County in the east, Wanzhou District in the west, Lichuan City, Enshi Prefecture in Hubei Province in the south, and Kaizhou District and Wuxi County in the north, covering an area of 3649 square kilometers. By December 28, 2015, Yunyang County had jurisdiction over 4 streets, 31 towns and 7 townships (1 nationality township), with a permanent population of 898700 and a registered population of 1.3596 million. There are 145 cultural relics in Yunyang County, including ancient buildings, ancient sites, ancient tombs, stone carvings and other cultural relics listed in the National Cultural relics Distribution Map, including 1 national cultural relics protection unit, 3 provincial protection units and 1 county level cultural relics protection units.
Airport In YunYang County - Chongqing Jiangbei International Airport
Chongqing Jiangbei International Airport (Chongqing Jiangbei International Airport, IATA: CKG, ICAO: ZUCK), located in Lianglu Street, Yubei District, Chongqing, China, 19 kilometers from the city center, is a 4F civil international airport.   It is one of the eight major regional hub airports in China;    It is an air port that implements a 144-hour transit visa-free policy.  
Chongqing Jiangbei International Airport was officially completed and opened to traffic on January 22, 1990, and was named Chongqing Jiangbei Airport; it was renamed Chongqing Jiangbei International Airport in 1998; the second phase of expansion was completed in October 2005; the third phase of expansion was completed in December 2010; in 2017 The fourth phase of expansion was completed in August.      In November 2020, the T3B terminal and the fourth runway project officially started.  
According to information in May 2022, Chongqing Jiangbei International Airport has three terminal buildings, namely T1, T2 (domestic) and T3A (domestic and international), with a total of 737,000 square meters;   There are three runways with lengths of 3,200 meters, 3,600 meters, and 3,800 meters; the apron is 1.66 million square meters, with 209 seats,     The cargo area is 230,000 square meters; it can guarantee an annual passenger throughput of 45 million person-times, a cargo and mail throughput of 1.1 million tons, and an aircraft take-off and landing of 373,000 sorties.     As of the end of 2018, a total of 329 domestic and international routes have been opened, covering 203 cities.  
In 2021, Chongqing Jiangbei International Airport will handle 35.7663 million passengers, a year-on-year increase of 2.4%; cargo and mail throughput will be 476,700 tons, a year-on-year increase of 15.9%; aircraft movements will be 280,600, a year-on-year increase of 2.2%; 4. 8th and 6th.  
When the T3A terminal of Chongqing Jiangbei International Airport is opened, T1 will be suspended. Except the domestic flights of West Air, Sichuan Airlines, China Airlines, Spring Airlines, Jiuyuan Airlines, Guilin Airlines, Longjiang Airlines, Qingdao Airlines, Donghai Airlines, Changan Airlines, Suparna Airlines, and Lucky Air operate at T2   , and the rest of the airlines' flights will be moved to T3A.   In addition, the airport has opened a free shuttle bus that circulates between the three terminals.  
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