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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.

Tongcheng, a county-level city under the jurisdiction of Anhui Province, is hosted by Anqing City. It is located in the southwest-central part of Anhui Province, with the Dabie Mountains in the west and the Yangtze River in the south, Lujiang County and Congyang County in the east, Shucheng County in the north, Qianshan City in the west, Huining County and Yixiu District in Anqing City in the south, with an administrative area of 1472 square kilometers. Tongcheng was called "Tongguo" in ancient times, which got its name because it is suitable for planting paulownia. In the second year of Tang Zhide (757), it was officially named "Tongcheng". In August 1996, Tongcheng withdrew its county and established a city. Tongcheng is high in the northwest and low in the southeast, with stepped distribution of mountains, hills and plains, overlapping mountains in the northwest, gentle slopes in the central hills, and vertical and horizontal paths in the southeast plain; it belongs to the subtropical humid monsoon climate with four distinct seasons and abundant rainfall. Tongcheng has a total population of 754000 (2018), including 12 towns and 3.
Airport In Tongcheng - Anqing Tianzhushan Airport
Anqing Tianzhushan Airport (IATA: AQG, ICAO: ZSAQ), located in Xiangshan Village, Yixiu District, Anqing City, Anhui Province, China, 6 kilometers south of Anqing city center, is a 4C-level domestic military-civilian joint regional airport   .
On December 22, 1993, Anqing Airport opened civil aviation business; on October 18, 2005, Anqing Airport was renamed "Anqing Tianzhushan Airport"; on February 1, 2015, the index level of the flight area of ​​Anqing Tianzhushan Airport was changed to 4C   ; On July 18, 2022, the T2 terminal of Anqing Tianzhushan Airport will be opened   .
As of July 2022, the terminal building of Anqing Tianzhushan Airport covers an area of ​​13,928 square meters, with 4 boarding bridges; 6 C-class seats on the civil aviation apron; the runway is 2,800 meters long and 50 meters wide; Annual passenger throughput of 1.3 million passengers, cargo and mail throughput of 5,500 tons, and aircraft take-off and landing of 13,402 sorties     [twenty one]  .
In 2021, Anqing Tianzhushan Airport will handle a total of 596,482 passengers, a year-on-year increase of 38.2%, ranking 121st in the country; cargo and mail throughput will be 2,899.4 tons, a year-on-year increase of 3.1%, ranking 87th in the country; sorties, a year-on-year increase of 35.6%, ranking 141st in the country   .
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