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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.

Dong'an County, belonging to Yongzhou City, Hunan Province, is located in the southwest of Hunan Province, the upper reaches of Xiangjiang River; the terrain is high in the northwest and low in the southeast; it is a mid-subtropical monsoon humid climate zone with four distinct seasons; the total area of the county is 2219 square kilometers. As of 2018, Dongan County has jurisdiction over 13 towns, 2 townships and 2 forest farms, with a registered population of 646500 and a resident population of 578500. Dongan County was located in the south of Chu during the Spring and Autumn and warring States period, Yingyang County was established in the Western Jin Dynasty (290 years), and Dongan County was first established in the Northern Song Dynasty (984). He gave birth to historical celebrities such as Deng Sanfeng, Shangshu of the Libu Department of the Southern Song Dynasty, Xi Baotian, Prince Shaobao of the Qing Dynasty, Tang Renlian, the governor of Guangdong in the Qing Dynasty, Binbucheng, the "locomotive" of the modern machinery industry, and Tang Shengzhi, a famous patriotic general. Dong'an is also the first batch of named "hometown of Wushu & amp" in the country.
Airport In Dongan - Yongzhou Lingling Airport
Yongzhou Lingling Airport (Yongzhou Lingling Airport, IATA: LLF, ICAO: ZGLG), referred to as "Yongzhou Airport", is located on Yingbin Road, Lanjiaoshan Street, Lengshuitan District, Yongzhou City, Hunan Province, China, 9.5 kilometers north of the urban area of ​​Lengshuitan District, 12.5 kilometers away from the urban area of ​​Lingling District in the south, it is a 4C-level naval military-civilian joint feeder airport and a first-level permanent military airport of the Chinese People's Liberation Army Naval Air Force   .
In October 1993, the Central Military Commission agreed that Lingling Caijiabu Airport should be used for both military and civilian use, and the civilian part was named "Yongzhou Lingling Airport"; on April 30, 2001, the civilian part of Yongzhou Lingling Airport was officially opened to navigation   ; On April 18, 2019, the runway of Yongzhou Lingling Airport was suspended for renovation   ; On January 31, 2021, Yongzhou Lingling Airport will resume flights   .
As of January 2021, the terminal area of ​​Yongzhou Lingling Airport is 4,705.8 square meters, and there are 6 C-class seats on the civil aviation apron; the runway is 2,600 meters long and 50 meters wide; it can guarantee an annual passenger throughput of 1.15 million passengers, aircraft The demand for take-off and landing of 30,000 sorties; the largest usable models are Boeing B737-800, Airbus A320-200, Airbus A321-200   .
In 2021, Yongzhou Lingling Airport will handle a total of 165,801 passengers, ranking 192nd in the country; cargo and mail throughput will be 3.2 tons, ranking 222nd in the country; aircraft take-offs and landings will be 1998, ranking 209th in the country   .
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