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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.

Changling County is the escrow county of Songyuan City, Jilin Province, located in the west of Jilin Province, southwest of Songyuan City, between 123 °6'E and 124 °45'E, 43 °59'N and 44 °42'N. It is bordered by Nong'an County in the east, Gongzhuling City and Shuangliao City in the south, Horqin left Middle Banner in Inner Mongolia in the west, and Tongyu, Qian'an and Qianerrose Mongolian Autonomous County in the north. It has jurisdiction over 8 townships and 12 towns. The county covers an area of 5728.4 square kilometers, with a total population of 640000 (2012). The county government is stationed in Changling Town. In 2013, the GDP of Changling County reached 30 billion yuan, an increase of 22.4 percent over 2012, with full-caliber revenue of 650 million yuan and local-level revenue of 465 million yuan. Longfeng Mountain is a famous scenic spot in Changling County.
Airport In Changling County - Songyuan Chagan Lake Airport
Songyuan Chaganhu Airport (Songyuan Chaganhu Airport, IATA: YSQ, ICAO: ZYSQ), located in Chaganhu Village, Waiqi Ranch, Baodian Township, Chaganhu Tourism Economic Development Zone, Qianguoerluosi Mongolian Autonomous County, Songyuan City, Jilin Province, China, northeast It is 31.5 kilometers away from the center of Songyuan and 29.5 kilometers away from the county seat of Qiangolluosi Mongolian Autonomous County. It is a 4C-level Chinese domestic tourism feeder airport   .
On June 20, 2015, Songyuan Chagan Lake Airport officially started construction; on May 22, 2017, Songyuan Chagan Lake Airport successfully completed the school flight   ; On October 29, 2017, Songyuan Chagan Lake Airport was officially opened to navigation   .
As of July 2019, Songyuan Chagan Lake Airport has a one-story and a half-style process terminal building with an area of ​​6,000 square meters, with 2 boarding bridges; 5 seats on the station apron, including 1 class B Seats, 4 C-class seats; runway 2,500 meters long, 45 meters wide; can meet the annual passenger throughput of 400,000 passengers, 2,000 tons of cargo and mail throughput, and 29,322 aircraft takeoffs and landings     .
In 2019, Songyuan Chagan Lake Airport handled a total of 152,441 passengers, a year-on-year decrease of 4.4%, ranking 204th in the country; cargo and mail throughput was 58.1 tons, a year-on-year increase of 6.1%, ranking 195th in the country; flight movements were 1.8286 million vehicles, a year-on-year decrease of 2.4%, ranking 99th in the country   .
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