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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.

Yanji City belongs to Yanbian Korean Autonomous Prefecture of Jilin Province. Yanji City is the center of politics, economy, culture and foreign exchanges of the whole prefecture. It is located in the east of Jilin Province, the middle of Yanbian Prefecture, the northern foot of Changbai Mountain, the hinterland of Northeast Asia economic circle, and a fulcrum of the Tumen River "Golden Triangle" drawn up by the United Nations. It is only 60 kilometers away from the Sino-Russian border, 80 kilometers away from the Sea of Japan, and more than 10 kilometers away from the border between China and North Korea in the south. Yanji is a central city in the east of Jilin Province, an excellent tourist city in China and one of the top 100 counties in China. The comprehensive economic strength of Yanji county has always been in the first place in Jilin Province. The scenic spots in Yanji are: Maoershan National Forest Park, Chengzishan Mountain City site, Mengdu Beauty Folk Tourism Resort, Chunxing Village, Korean ancient village and so on. Yanji is listed as the first batch of national new urbanization.
Airport In Yanji - Yanji Chaoyangchuan International Airport
Yanji Chaoyangchuan International Airport (Yanji Chaoyangchuan International Airport, IATA: YNJ, ICAO: ZYYJ), located in Chaoyangchuan Town, Yanji City, Yanbian Korean Autonomous Prefecture, Jilin Province, is a 4C-level military-civilian airport.  
Yanji Chaoyangchuan International Airport was built in 1952. In 1985, with the approval of the State Council and the Central Military Commission, Yanji Chaoyangchuan Airport was converted into a military-civilian airport. On August 29, 1985, Yanji Chaoyangchuan Airport opened civil aviation routes. In December 1993, Yanji Chaoyangchuan Airport completed the flight area expansion project. In April 1997, the new terminal building project was completed. On June 9, 2017, it was approved by China Civil Approved by the Aviation Administration, the name was changed to Yanji Chaoyangchuan International Airport.   
As of April 2022, Yanji Chaoyangchuan International Airport has a terminal building with an area of ​​21,720 square meters, 4 covered bridges, 11 parking stands, and a 2,600-meter-long runway. It has 16 domestic and foreign waypoints, including 15 domestic waypoints and 1 foreign waypoint.   
In 2021, the passenger throughput of Yanji Chaoyangchuan International Airport will be 580,500, a year-on-year increase of 1.4%, ranking 123rd in the country; the cargo and mail throughput will be 3,691.1 tons, a year-on-year decrease of 1.3%, ranking 82nd in the country, with 6,087 take-offs and landings, A year-on-year increase of 6.0%.  
At 16:05 on October 30, 2022, the Chengdu Tianfu-Yantai-Yanji round-trip route was officially opened.  
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