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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.

Changsha, the capital of Hunan Province, is an important central city in the middle reaches of the Yangtze River, an experimental area for the comprehensive reform of the "two-oriented society" in China, an important grain production base in China, an important node city in the urban agglomeration in the middle reaches of the Yangtze River and an important node city in the Yangtze River economic belt. Changsha is a comprehensive transportation hub, where Beijing-Guangzhou high-speed railway, Shanghai-Kunming high-speed railway and Chongqing-Xiamen high-speed railway meet. Changsha is located in the north-east of Hunan Province, the lower reaches of Xiangjiang River and the western margin of Changsha Basin. The total area is 11819 square kilometers; it has jurisdiction over six districts, one county and two county-level cities; in 2018, the resident population is 8.1547 million, the urbanization rate is 77.59 percent, and the regional GDP is 1.100341 trillion yuan. The territory has great ups and downs, various geomorphological types and well-developed surface water system. The climate is mild, the four seasons are distinct, and the Xiangjiang River passes through the city. Changsha is the first country.
Airport In Changsha - Changsha Huanghua International Airport
Changsha Huanghua International Airport (Changsha Huanghua International Airport, IATA: CSX, ICAO: ZGHA, CAAC: HHA), located at No. 1 Airport City, Huanghua Town, Changsha County, Changsha City, Hunan Province, China, 23.5 kilometers west of Changsha city center, 4E It is a first-class international airport, one of the twelve major trunk line airports in China, an airport with international scheduled flights, a first-class air port open to the outside world, one of the top ten regional international aviation hubs in China, the gateway airport of China (Hunan) Free Trade Pilot Zone, Hunan Airlines Main operating base        .
On June 25, 1986, the construction of Changsha Huanghua Airport started   ; On August 29, 1989, Changsha Huanghua Airport was officially opened, and Changsha Datuopu Airport was converted into a military airport; in 1993, Changsha Huanghua Airport was officially renamed Changsha Huanghua International Airport; on July 19, 2011, Changsha Huanghua International Airport T2 Terminal opened   ; On January 1, 2016, Changsha Huanghua International Airport implemented a 72-hour visa-free transit policy for foreigners   ; On March 30, 2017, the second runway of Changsha Huanghua International Airport was opened; on May 16, 2018, the T1 terminal of Changsha Huanghua International Airport was reopened   .
As of July 2021, Changsha Huanghua International Airport has 2 terminals, of which the T1 terminal covers an area of ​​53,000 square meters, the T2 terminal covers an area of ​​213,000 square meters, and the total area of ​​4 air cargo terminals is 82,471 square meters; There are 87 aircraft positions on the civil aviation station, 32 of which are close to the aircraft; there are 2 short-distance runways, the first runway is 3,200 meters long and 45 meters wide, and the second runway is 3,800 meters long and 60 meters wide; it can meet the annual passenger throughput 35 million passengers, 440,000 tons of cargo and mail throughput, and 244,000 aircraft takeoffs and landings           .
In 2021, Changsha Huanghua International Airport will handle a total of 19,983,064 passengers, a year-on-year increase of 3.9%, ranking 12th in the country; cargo and mail throughput will be 209,074.5 tons, a year-on-year increase of 8.9%, ranking 16th in the country; aircraft movements will reach 162,977 Flights, a year-on-year increase of 4.3%, ranking 15th in the country   .
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