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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.

Jiuzhaigou County, which belongs to Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province, is located on the eastern edge of the Qinghai-Tibet Plateau and northeast of Aba Prefecture. It is bordered by Wen County, Zhouqu County and Diebu County in Gansu Province to the east and north, and Ruoergai County, Pingwu County and Songpan County in Sichuan Province to the west and south. The total area is 5288 square kilometers. The topography of Jiuzhaigou County is high in the northwest and southwest and low in the southeast. It belongs to the humid climate of the plateau. Jiuzhaigou, which has won three international laurels of "World Natural Heritage", "World Biosphere Reserve" and "Green Global 21" and the first batch of national 5A scenic spots, there are also provincial Wujiao Giant Panda Nature Reserve, Baihe Golden Monkey Nature Reserve, Gongleiling Nature Reserve, Ganhaizi National Forest Park and Shenxianchi Scenic spot, Jiamu Tianchi, Heihe Scenic Belt, Yuwashi Red Leaf Scenic spot,
Airport In Jiuzhaigou - Jiuzhai Huanglong Airport
Jiuzhai Huanglong Airport (Jiuzhai Huanglong Airport, IATA: JZH, ICAO: ZUJZ), commonly known as Jiuhuang Airport, is located about 12 kilometers north of Chuanzhusi Town, Songpan County, Aba Tibetan and Qiang Autonomous Prefecture, Sichuan Province, China, and 88 kilometers north of Jiuzhaigou Scenic Area , 43 kilometers east of Huanglong, is a 4D-level tourist feeder airport and a first-class high-altitude airport (3447.65 meters)   .
On September 26, 2003, Jiuzhai Huanglong Airport was completed and opened to navigation; from August 8, 2017 to April 18, 2018, Jiuzhai Huanglong Airport was suspended due to the earthquake; on December 4, 2019, Jiuzhai Huanglong Airport's aviation port construction Project started    .
According to the official website of Air China in 2020, Jiuzhai Huanglong Airport has 2 terminals with an area of ​​20,000 square meters; T1 has 3 boarding bridges, and T2 has 4 boarding bridges; There are 12 aircraft seats on the flat, including 5 D-class seats and 7 C-class seats; the runway is 3,400 meters long and 45 meters wide; it can meet the annual passenger throughput of 2.5 million passengers, cargo and mail throughput of 2,250 tons, and Reduce the use demand of 25080 sorties   .
In 2021, Jiuzhai Huanglong Airport will handle a total of 150,029 passengers, a year-on-year increase of 22.6%, ranking 201st in the country; cargo and mail throughput will be 16.9 tons, a year-on-year decrease of 87.0%, ranking 207th in the country; aircraft takeoffs and landings will be 2,222, Year-on-year growth of 41.3%, ranking 204th in the country   .
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