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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.

Hohhot, commonly known as Hohhot, formerly known as Guisui, is the capital of Inner Mongolia Autonomous region, the political, economic and cultural center of Inner Mongolia, and an important central city in the border areas of northern China approved by the State Council. By 2018, the city had jurisdiction over four districts, four counties and one flag, with a total area of 17224 square kilometers, a built-up area of 260 square kilometers, a resident population of 3.126 million, and an urban population of 2.183 million, with an urbanization rate of 69.8%. Located in North China, the northern frontier and the interior of Eurasia, Hohhot is the core city of the Hubao silver urban agglomeration and the central city of the Hubao-Hubei urban agglomeration. it is an important bridge connecting the Yellow River economic belt, the Eurasian continental bridge and the economic region around the Bohai Sea. it is also an important open central city along the border that China opens to Mongolia and Russia.
Airport In Huhehaote、Huhehot - Hohhot Baita International Airport
Hohhot Baita International Airport (Hohhot Baita International Airport, IATA: HET; ICAO: ZBHH) is located on Airport Road, Saihan District, Hohhot, Inner Mongolia Autonomous Region, China; 14.3 kilometers away from the city center, it is a 4E-class civil international airport; it is the first in Inner Mongolia Autonomous Region big aviation hub   .
Hohhot Baita International Airport was officially completed and opened to navigation on October 1, 1958, named Hohhot Baita Airport; it was renamed Hohhot Baita International Airport on December 27, 2004; the first phase of the expansion project was completed on July 16, 1987; The second-phase expansion project was completed in July 1997; the third-phase expansion project was completed on July 28, 2007.  
According to the official website of the airport in October 2018, Hohhot Baita International Airport has a terminal building, T1 (domestic and international in China), with a total of 54,400 square meters; a runway with a length of 3,600 meters; 43 parking positions   ;A total of 124 domestic and international routes have been opened in China, covering 91 cities   .
In 2019, the passenger throughput of Hohhot Baita International Airport was 13.1518 million passengers, a year-on-year increase of 68.2%; the cargo and mail throughput was 46,100 tons, a year-on-year increase of 14.8%; the number of takeoffs and landings was 112,100, a year-on-year increase of 6.5%; 32nd, 41st, 32nd   .
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