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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.

Daan is a county-level city in Baicheng City, Jilin Province, which is located in the northwest of Jilin Province and in the hinterland of Songnen Plain. The total area is 4879 square kilometers. As of 2014, Daan has jurisdiction over 5 streets, 10 towns and 8 townships. There are 430000 people in Daan. There are 104 ancient cultural relics in Daan City, such as the Neolithic site, the Han Shu site of the Yin and Shang dynasties, the Banshan site of the Liao and Jin dynasties, and the Princess Mausoleum of the Qing Dynasty. The famous scenic spot in Daan City is Nenjiang Bay National Wetland Park. In 2019, it was listed as the second batch of national agricultural product quality and safety counties. ...
Airport In Daan City - Baicheng Chang'an Airport
Baicheng Chang'an Airport (BaiCheng ChangAn Airport, IATA: DBC, ICAO: ZYBA), located in Diaojiatun Airport Road, Taohe Town, Taobei District, Baicheng City, Jilin Province, China, 18.5 kilometers away from the center of Baicheng City in the northwest, is a 4C-level military-civilian regional airport   .
On October 26, 2012, the foundation stone of Baicheng Chang'an Airport was laid; on May 25, 2016, the test flight of Baicheng Chang'an Airport was successful; on March 31, 2017, Baicheng Chang'an Airport was officially open to navigation, and it was implemented for military and civilian use   .
As of February 2021, the terminal area of ​​Baicheng Chang'an Airport is 4,500 square meters, and the parking lot area is 4,000 square meters; there are 1 Class B seat and 3 Class C seats on the civil aviation station; the runway is 2,500 meters long and 45 meters wide ; It can meet the needs of annual passenger throughput of 200,000 passengers, cargo and mail throughput of 700 tons, and annual aircraft take-off and landing of 2,459 sorties      .
In 2020, Baicheng Chang'an Airport completed a total of 73,838 passenger throughput, a year-on-year increase of 13.3%, ranking 211th in the country; cargo and mail throughput was 1.2 tons, a year-on-year increase of 17.4%, ranking 221st in the country; aircraft took off and landed 1,594 sorties, Year-on-year growth of 120.8%, ranking 209th in the country   .
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