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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.

Rugao City, a county-level city in Jiangsu Province, hosted by Nantong City, is a famous historical and cultural city at the provincial level. It is located in the north wing of the Yangtze River Delta, across the river from Suzhou; it is connected with Rudong County in the east, Tongzhou District in the south, Taizhou City in the west and Haian City in the north. The city has a total area of 1477 square kilometers (excluding the Yangtze River) and a population of 1.25 million (2016). Rugao City is rated as one of the six longevity townships in the world by the International Association of Natural Medicine. By the end of 2011, there were more than 1.4528 million centenarians in Rugao, ranking first among counties (cities) in China. In addition, there are more than 4000 people over 90 years old and more than 40000 people over 80 years old in Rugao City. In October 2018, he was selected as the national investment potential in 2018.
Airport In RuGao City、JuKao - Nantong Xingdong International Airport
Nantong Xingdong International Airport (Nantong Xingdong International Airport, IATA: NTG, ICAO: ZSNT), located in Tongzhou District, Nantong City, Jiangsu Province, China, is 10 kilometers away from the city center. It is a 4E-level civilian international airport and the first in Jiangsu Province. A civil transport airport solely used by civil aviation   , is also the auxiliary airport of Shanghai International Aviation Hub   .
Nantong Xingdong International Airport was officially completed on August 24, 1993 and named Nantong Xingdong Airport; it was renamed Nantong Xingdong International Airport on July 22, 2016   ;The first phase of reconstruction and expansion was completed in April 2012; the second phase of reconstruction and expansion was completed on August 18, 2019    .
As of August 2019, Nantong Xingdong International Airport has two terminals, namely T2 (suspended) and T3 (domestic and international in China), with a total area of ​​67,000 square meters; there is a runway with a length of 3,400 meters; 34 parking spaces   . As of March 2019, Nantong Xingdong International Airport has 37 domestic and international navigation cities   .
In 2019, the passenger throughput of Nantong Xingdong International Airport was 3.4844 million passengers, a year-on-year increase of 25.7%; the cargo and mail throughput was 42,200 tons, a year-on-year decrease of 1.7%; the number of takeoffs and landings was 34,500, a year-on-year increase of 2.4%; 51st, 42nd, 70th   .
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