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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.

Haikou, also known as "Coconut City", the capital of Hainan Province, the strategic fulcrum city of the national "Belt and Road Initiative", the core city of China (Hainan) Free Trade Experimental Zone (Hong Kong), located between 19 °31 °N, 20 °04 °N and 110 °42'E, located in the north of Hainan Island, Wenchang to the east, Chengmai to the west, Pidingan to the south, Qiongzhou Strait to the north, Hainan Province is the political, economic, scientific and technological, cultural center and the largest transportation hub in Hainan Province. Haikou is located in the tropics, with a variety of tropical resources, and is a southern coastal city rich in natural and beautiful seaside scenery. Since the opening of the port in the Northern Song Dynasty, it has a history of thousands of years. Haikou was founded on December 9, 1926 and liberated on April 23, 1950. On April 13, 1988, Hainan established a special economic zone.
Airport In Haikou - Haikou Meilan International Airport
Haikou Meilan International Airport (IATA: HAK, ICAO: ZJHK), located 18 kilometers southeast of Haikou City, Hainan Province, China, is an international airport and a regional aviation hub       , the permit specifies that the flight zone indicator is 4E, and the airport design flight zone indicator is 4F   .
Haikou Meilan International Airport officially opened to traffic on May 25, 1999; in December 2011, it became the first airport in China to have an outlying island duty-free shop; in January 2016, the first phase of the terminal building reconstruction and expansion project was completed; in November 2015, it began Phase II expansion project;   In April 2019, the main body of the second phase terminal of Haikou Meilan International Airport was basically completed   ; On June 1, 2020, the second phase of the expansion project will conduct its first school flight;   On December 2, 2021, the second phase of the airport project was officially put into operation.  
According to the official website of the airport in January 2022, Haikou Meilan International Airport covers an area of ​​1,140 hectares, with a station area of ​​1.2502 million square meters. It has a runway with a length of 3,600 meters and a width of 45 meters and a runway of 3,600 meters in length and width The runway; the total size of the terminal building is nearly 450,000 square meters, with 139 parking spaces.  
As of December 2, 2021, Haikou Meilan International Airport has opened 235 routes, including 225 domestic routes, 9 international cargo routes, and 1 regional cargo route. There are 122 cities in total, including 111 domestic cities and international cargo routes. There are 10 cargo navigation cities and 1 regional cargo navigation cities.  
As of December 2, 2021, the passenger throughput of Haikou Meilan International Airport reached 16.2108 million person-times; the number of flight movements reached 126,500; The throughput ranks 16th in the country.  
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