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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.

Chang'an District, Xi'an City, Shaanxi Province is located in the hinterland of Guanzhong Plain, south by Qinling Mountains, surrounded by Xi'an from the west and south, with mountains, rivers and plateaus, with a total area of 1580 square kilometers and 25 subdistrict offices. The resident population of the region is 1.130213 million (2019) and the registered permanent population is 1.083 million (2016). Changan District has a superior location and convenient transportation, and the Weiqu residence of the district government is only 8.7 kilometers away from the clock tower in the core of Xi'an. Ancient Chang'an was once the capital of 13 dynasties, including Zhou, Qin, Han and Tang dynasties. There are ten sites including the Fenghao site of the Zhou Dynasty, the Afang Palace of the Qin Dynasty, and eight famous mountains, including Cuihua Mountain, Wutai Mountain, Xiangyu Mountain and Qinghua Mountain. There are 42 monasteries, including Xingjiao Temple, Huayan Temple, Xiangji Temple, and the ten major sects of Buddhism, including Fa Xiangzong, Pure Land sect and Huayan Temple.
Airport In Chang'an District - Shijiazhuang Zhengding International Airport
Shijiazhuang Zhengding International Airport (IATA: SJW, ICAO: ZBSJ), located in the northeast of Zhengding County, Shijiazhuang City, Hebei Province, China, is 32 kilometers away from the urban area. Important air gateway, alternate airport of Beijing Capital Airport, regional aviation hub   , An important international air cargo transit base in northern China.  
Shijiazhuang Zhengding International Airport officially opened on February 18, 1995. In March 1996, Shijiazhuang Air Port was officially opened to the outside world. In July 2008, Shijiazhuang Zhengding Airport was renamed "Shijiazhuang Zhengding International Airport". The total length of the airport runway is 3,400 meters. There are two terminal buildings, No. 1 and No. 2, with a total area of ​​209,000 square meters.  
In 2020, Shijiazhuang Zhengding International Airport will handle 8.203 million passengers, a year-on-year decrease of 31.2%; cargo and mail throughput will be 86,390.4 tons, a year-on-year increase of 62.3%; aircraft movements will be 76,800, a year-on-year decrease of 1.4%.  
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