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Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions with 6.245 million residents in 2020. The city's population at the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. As of 2021[update], the Philadelphia metropolitan area was the state's largest and nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. The city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. Philadelphia and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Huangshan, referred to as Huihe or Huang, is a prefecture-level city in Anhui Province, known as Xin'an, Shizhou and Huizhou in ancient times, located at the junction of Anhui, Zhejiang and Jiangxi provinces, and is known as the "thoroughfare of the three provinces". It is bordered by Jingdezhen City and Wuyuan County in Jiangxi Province in the southwest, Kaihua, Chunan and Lin'an counties in Zhejiang Province in the southeast, Jixi, Jingde and Jing counties in Xuancheng City, Anhui Province in the northeast, and Shitai, Qingyang and Dongzhi counties in Chizhou City in the northwest. In 1987, the establishment of Huizhou was abolished and a prefecture-level city was established in the name of "Huangshan". It is a member city of Hangzhou metropolitan area. Huangshan City has a total area of 9807 square kilometers. By the end of 2015, it had jurisdiction over 3 municipal districts and 4 counties, with a total resident population of 1.3737 million. In 2015, the city's GDP reached 53.09 billion yuan, an increase of 6.1 percent over 2014.
Airport In Huangshan - Huangshan Tunxi International Airport
Huangshan Tunxi International Airport (Huangshan Tunxi International Airport; IATA: TXN, ICAO: ZSTX), located in Tunxi District, Huangshan City, Anhui Province, China, 5.5 kilometers away from the central city, is a 4D civil transport airport   .
Huangshan Tunxi International Airport opened to traffic in October 1959 and was named Tunxi Airport. It was renamed Huangshan Tunxi Airport in 1987 and was renamed Huangshan Tunxi International Airport in June 2014. The first phase of the expansion project was carried out in 1966 and completed in 1980. The second phase of the expansion project, the third phase of the expansion project in 1987, the fourth phase of the expansion project in July 2000, and the fifth phase of the expansion project in 2017   .
According to information on the airport's official website in May 2019, Huangshan Tunxi International Airport has a terminal building, T1 (China's domestic and international Hong Kong, Macao and Taiwan), with a total area of ​​14,000 square meters; a total of 1 runway with a length of 2,600 meters; apron 49,000 square meters, 8 aircraft seats; can guarantee an annual passenger throughput of 1.12 million person-times   . According to the information on the airport's official website in May 2019, there are 24 domestic and international navigation cities in China.  
In 2020, due to the decline due to the impact of the global epidemic, the passenger throughput of Huangshan Tunxi International Airport was 444,200, a year-on-year decrease of 48.9%; the cargo and mail throughput was 1,300 tons, a year-on-year decrease of 32.6%; The need to drop by 40.5%; ranking 129th, 103rd, and 149th in China respectively. In 2019, they ranked 114th, 94th, and 130th in China respectively   .
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