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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.

Tianzhen County, located in the northeast end of Datong City, Shanxi Province, belongs to Datong City, Shanxi Province. It is located at the junction of Shanxi, Hebei and Inner Mongolia provinces (regions), with Huaian County in Hebei Province in the east, Yangyuan County in Hebei Province in the south, Yanggao County in the west and Xinghe County in Inner Mongolia in the north. Tianzhen County has a total land area of 1718 square kilometers and has jurisdiction over 5 towns, 7 townships and 235 administrative villages. it is a key county in national poverty alleviation and development work, and has been listed as a poverty-stricken area in Yanshan-Taihang Mountains. Tianzhen County has a long history and was inhabited as early as the Neolithic Age. during the warring States period, Yanling County was built in the Western Han Dynasty, Tianchengjun was established in the Tang Dynasty, Tiancheng County was changed to Tiancheng County in the Liao Dynasty, and Tianchengwei was reformed in the Ming Dynasty. Tianzhen Wei was synthesized in the third year of Qingshunzhi (1646), and Tianzhen was called Tianzhen in the third year of Yongzheng (1725).
Airport In Tianzhen - Datong Yungang Airport
Datong Yungang Airport (Datong Yungang Airport, IATA: DAT, ICAO: ZBDT), located on Beinanhuan East Road, Beijiazao Town, Yunzhou District, Datong City, Shanxi Province, China, 15.5 kilometers west of the center of Datong, is a 4C-level international regional airport , temporary air port airport   .
On December 26, 2005, Datong Beijiazao Airport was completed and opened to traffic, and the civil aviation of Datong Huairen Airport was suspended   ; On July 27, 2012, Datong Beijiazao Airport officially changed its name to Datong Yungang Airport   ; On September 21, 2013, the air port of Datong Yungang Airport was officially opened to the public temporarily   .
As of June 2021, Datong Yungang Airport has two terminal buildings, of which T1 (international) terminal covers an area of ​​6328.2 square meters, T2 (domestic) terminal covers an area of ​​10854 square meters; There are 7 seats, including 6 class C seats and 1 class B seat; the runway is 3,000 meters long and 45 meters long, which can meet the needs of annual passenger throughput of 900,000 passengers and cargo and mail throughput of 4,700 tons   .
In 2021, Datong Yungang Airport will handle a total of 885,224 passengers, a year-on-year increase of 18.8%, ranking 100th in the country; cargo and mail throughput will be 1,602.7 tons, a year-on-year decrease of 2.0%, ranking 97th in the country; aircraft movements will be 21,468 sorties, a year-on-year increase of 28.6%, ranking 86th in the country   .
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