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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.

Longan County, which belongs to Nanning City, Guangxi Zhuang Autonomous region, is located in the southwest of Guangxi Zhuang Autonomous region and on both sides of the lower reaches of the Youjiang River. it is located at 107 °21 °E longitude 108 °6 °E, 22 °51 °N 23 °21 °N, Wuming County to the east and northeast, West Liantian County and Daxin County, which is connected to pingguo County in the northwest and bordered by Xixiangtang District of Nanning City and Jiangzhou District and Fusui County of Chongzuo City in the south. The maximum horizontal distance between east and west is 77 km and the maximum vertical distance between north and south is 56 km. With a total area of 2277 square kilometers, Longan County belongs to the humid monsoon climate of the south subtropics, hot and rainy, short in winter and long in summer. As of 2018, Longan County has jurisdiction over 6 towns and 4 townships, and the county people's government is stationed in Chengxiang Town. Longan County is an important transportation hub of railways, highways and waterways in Southwest China. As of 2018, Longan County
Airport In Long'an County - Nanning Wuxu International Airport
Nanning Wuxu International Airport (Nanning Wuxu International Airport, IATA: NNG; ICAO: ZGNN), located in Wuxu Town, Jiangnan District, Nanning City, Guangxi Zhuang Autonomous Region, China, 27.8 kilometers away from the city center   , is a 4E-level military-civilian international airport, the largest aviation hub in Guangxi Zhuang Autonomous Region, one of China's tens of millions of airports, an international gateway hub airport facing ASEAN, a first-class air port open to the outside world, and an alternate airport for international flights.  
Nanning Wuxu International Airport was officially completed and opened to navigation in November 1962   , was relocated from Nanning Airport in 1958; the first-phase expansion project was completed in 1990; the second-phase expansion project was completed on September 25, 2014   ; In 2019, the renovation and expansion of the T1 terminal area and the expansion of the runway in the T2 terminal area will begin     ; On March 19, 2020, it was approved to build the second runway and T3 terminal   .
As of January 2019, Nanning Wuxu International Airport has two terminal buildings, namely T1 (under renovation) and T2 (China's domestic and international Hong Kong, Macao and Taiwan), with a total area of ​​214,800 square meters   There is a runway with a length of 3,200 meters and 64 parking spaces (excluding T1); it can meet the annual passenger throughput of 16 million passengers, cargo and mail throughput of 164,000 tons, and aircraft take-off and landing of 137,600 sorties   . As of March 2019, a total of 121 domestic and international routes have been opened, covering 93 cities   .
In 2020, due to the impact of the global epidemic, the passenger throughput of Nanning Wuxu International Airport was 10.5841 million passengers, a year-on-year decrease of 32.9%; the cargo and mail throughput was 107,100 tons, a year-on-year decrease of 12.4%; Decreased by 23.1%; ranking 27th, 29th and 30th in China respectively   ;
On July 11, 2021, the "air-to-air transfer" business of international orders will be launched   ; On July 9, the National Civil Aviation Administration issued the "Letter on Feasibility Study Report of Nanning Airport Reconstruction and Expansion Project and Other Relevant Opinions". Nanning Airport will be rebuilt and expanded, and a new second runway will be built.  
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