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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.

Chaisang District, formerly Jiujiang County, formerly known as Chaisang County and Runan County, is the municipal district of Jiujiang City, Jiangxi Province, one of the suburbs of Jiujiang City. Chaisang District is named after Chaisang Mountain, also known as the ancient city of Xunyang, which is one of the eighteen ancient counties in Jiangxi Province in history. Chaisang District is located in the north of Jiangxi Province, the southwest corner of Jiujiang City, the south bank of the middle and lower reaches of the Yangtze River, Xunyang District, Guanxi District and Lushan Scenic area in the east, Lushan City, Gongqing City and Dean County in the south, Ruichang City in the west, and Huangmei County and Wuxue City in Hubei Province in the north. Jiangzhou Town in the northeast is surrounded by water, which is the alluvial island of the Yangtze River, facing Poyang Lake and Hukou County, across the Yangtze River from Huangmei County in Hubei Province and Susong County in Anhui Province. The geographical coordinates of Chaisang district are between 115 °37'- 116 °15 'east and 29 °21'-29 °51 'north latitude.
Airport In ChaiSang District - Jiujiang Lushan Airport
Jiujiang Lushan Airport (Jiujiang Lushan Airport, IATA: JIU, ICAO: ZSJJ), referred to as "Lushan Airport", is located on Airport Road, Minshan Township, Chaisang District, Jiujiang City, Jiangxi Province, China, 8.5 kilometers away from the west gate of Lushan National Scenic Spot in the northeast. It is 16 kilometers away from the center of Chaisang District and 31 kilometers away from the center of Jiujiang. It is a 4C-level military-civilian tourism feeder airport   .
On June 18, 1996, Jiujiang Lushan Airport officially opened civil aviation services; in 2000, 2002, and 2006, Jiujiang Lushan Airport was suspended for three times; on March 21, 2015, Jiujiang Lushan Airport was suspended for renovation; on June 3, 2019 , Jiujiang Lushan Airport resumption and reconstruction project successfully tested flight   .
As of February 2021, the terminal building of Jiujiang Lushan Airport has an area of ​​11,815 square meters, and there are 3 category C remote stands on the civil aviation apron; the runway is 2,800 meters long and 50 meters wide, and can take off and land Airbus A320-200, Boeing B737- Models of 800 and below; can meet the needs of annual passenger throughput of 500,000 passengers   .
In 2021, Jiujiang Lushan Airport will handle a total of 15,880 passengers, ranking 241st in the country; 222 aircraft take-offs and landings, ranking 244th in the country   .
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