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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.

Yunyang District, formerly known as Yunxian County, belongs to Shiyan City, Hubei Province. On September 9, 2014, the State Council of China formally approved and revoked Yunxian County and established Yunyang District of Shiyan City. The administrative area of Yunyang County is the administrative area of Yunyang District. No. 1 Jinsha Road, Chengguan Town, where the people's Government of Yunyang District is stationed. On December 17, 2014, Yunxian County officially withdrew its name and changed its name to Yunyang District. As of September 2014, Yunyang District has jurisdiction over 16 towns, 5 townships, 1 forest farm and 1 economic development zone. Yunyang District spans 32 °25'N to 33 °16 °N and 110 °07'E to 111 °16'E. It is 92 km wide from north to south, 108km from east to west, wide at both ends and narrow in the middle, shaped like a goldfish, with a total area of 3863 square kilometers. As of 2013, a total of various types have been found in Yunyang District.
Airport In Yunyang - Shiyan Wudang Mountain Airport
Shiyan Wudangshan Airport (Shiyan Wudangshan Airport; IATA: WDS, ICAO: ZHSY) is located in Bailang Economic and Technological Development Zone, Shiyan City, Hubei Province, China, about 15 kilometers from the urban area, and about 25 kilometers from the Wudang Mountain Scenic Spot, a famous Taoist holy place in China. It is a 4C-level civil transport airport and a feeder airport in China.  
Shiyan Wudangshan Airport was officially completed and opened to navigation on February 5, 2016, and was named Shiyan Wudangshan Airport.  
According to information on the airport's official website in April 2019, Shiyan Wudangshan Airport has a terminal building, not T1 (domestic in China), with a total area of ​​16,400 square meters; a runway with a length of 2,600 meters; 7 parking spaces (2 Helicopter slots); can guarantee an annual passenger throughput of 1.2 million person-times, an annual cargo and mail throughput of 2,700 tons, and an annual aircraft take-off and landing of 16,173 sorties   . As of April 2019, a total of 17 domestic fixed routes have been opened in China, covering 26 cities   .
In 2018, the passenger throughput of Shiyan Wudangshan Airport was 1.1825 million passengers, a year-on-year increase of 36.0%; the cargo and mail throughput was 0.5 million tons; 112 bits   .
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