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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.

Changchun, referred to as "Chang" for short, also known as Chuncheng, Xidu, Chachong and Huanglongfu in ancient times, is the capital of Jilin Province, a vice-provincial city and the central city of Northeast Asia economic circle. It is one of the central cities and important industrial bases in Northeast China approved by the State Council. By 2018, the city had jurisdiction over seven districts, one state-level new district (Changchun New District, China's 17th state-level new district) and two county-level cities, with a total area of 20593.5 square kilometers (excluding Gongzhuling for the time being) and a built area of 519.04 square kilometers. the registered household population is nearly 8 million (excluding Gongzhuling for the time being), the urban population is 4.415 million, and the urbanization rate is 58.8%. Changchun is located in Northeast China, located in the geographical center of Northeast China, with Songyuan City, Siping City, Jilin City and
Airport In Changchun - Changchun Longjia International Airport
Changchun Longjia International Airport (Changchun Longjia International Airport, IATA: CGQ, ICAO: ZYCC), located at the junction of Donghu Town and Longjia Town, Jiutai District, Changchun City, Jilin Province, China, about 32 kilometers southwest of Changchun city center and southeast About 76 kilometers away from the center of Jilin, it is a 4E-level international trunk airport, an international regional hub in Northeast Asia, and a freight distribution center for China and Europe   .
On May 29, 2003, Changchun Longjiahu Airport officially started construction; on July 15, 2005, Changchun Longjiahu Airport was renamed "Changchun Longjia International Airport"; on August 27, 2005, Changchun Longjia International Airport officially Open to aviation, Changchun Dafangshen Airport and Jilin Ertaizi Airport have been transferred to this location for overall civil aviation operations   .
As of February 2021, Changchun Longjia International Airport has 2 terminals with a total construction area of ​​204,000 square meters; the civil aviation station has 61 aircraft seats, including 32 near aircraft seats; the runway is 3,200 meters long and 45 meters wide ; It can meet the needs of annual passenger throughput of 16 million passengers   .
In 2020, the passenger throughput of Changchun Longjia International Airport was 9.360541 million passengers, a year-on-year decrease of 32.8%, ranking 29th in the country; the cargo and mail throughput was 83,672 tons, a year-on-year decrease of 5.9%, ranking 32nd in the country; the number of aircraft movements was 75,510 Flights, down 23.6% year-on-year, ranking 37th in the country   .
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