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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.

Pengzhou is a county-level city under the jurisdiction of Sichuan Province, which is hosted by Chengdu. Pengzhou is Chengdu's northbound transportation hub, with Xindu District and Pidu District in the south, Dujiangyan City in the west, Guanghan City and Shifang City in the east. The city has a total area of 1421 square kilometers and has jurisdiction over 1 street and 19 towns. In 2018, the city has a total registered population of 802400 and a resident population of 777900. Pengzhou is located in the center of Chengdu-Demian Economic Zone, the northwest regional cooperation center of the development axis of Chengdu-Chongqing Economic Zone and the core area of Chengdu half-hour economic circle. It is one of the four new medium-sized industrial cities planned and developed in Chengdu and an important part of the eco-tourism belt of Longmenshan Giant Panda National Forest Park. Is the national intellectual property rights strong county project pilot county. Pengzhou has won "National Ecological City", "Top 100 Competitiveness of China's County economy" and "China".
Airport In Pengzhou City - Chengdu Shuangliu International Airport
Chengdu Shuangliu International Airport (Chengdu Shuangliu International Airport, IATA: CTU, ICAO: ZUUU), located at the junction of Shuangliu District and Wuhou District, Chengdu City, Sichuan Province, China, about 16 kilometers northeast from the center of Chengdu, is a 4F international aviation hub , one of the eight major regional hub airports in China   , an aviation hub and passenger and cargo distribution center in China's inland areas.     
The predecessor of Chengdu Shuangliu International Airport is Chengdu Shuangguisi Airport, which was built in 1938. On December 12, 1956, Chengdu Shuangguisi Airport was renamed Chengdu Shuangliu Airport.   On November 30, 1995, Chengdu Shuangliu Airport was approved to change its name to Chengdu Shuangliu International Airport. On August 9, 2012, Terminal 2 of Chengdu Shuangliu International Airport officially opened.   
According to the information on the airport's official website in August 2017, the airport has 2 terminals with a waiting area of ​​500,000 square meters, which can meet the annual passenger throughput of 50 million passengers. There are 3 air cargo terminals and 2 parallel runways. , there are 3 aircraft parking areas with a total area of ​​9.4127 million square meters; a total of 228 parking spaces (as of January 2020)   ; 270 air routes have been opened, connecting 209 cities at home and abroad.  
In 2019, Chengdu Shuangliu International Airport handled a total of 55,858,552 passengers, a year-on-year increase of 5.5%, ranking fourth in the country; cargo and mail throughput was 671,903.9 tons, a year-on-year increase of 1.0%, ranking sixth in the country; aircraft movements were 366,887 Flights, a year-on-year increase of 4.2%, ranking fifth in the country   .
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