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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.

Yanfeng District, located in the south of Hengyang City, is under the jurisdiction of Hengyang City, Hunan Province, formerly known as Chengnan District. Yanfeng District faces Zhuhui District in the east, Hengnan County in the south, steaming Xiang District in the west and Shigu District in the north. Legend has it that "the north wild goose flies to the south, then the wings stop and stop back", hence the name Yanfeng. Yanfeng District is located in Hengyang Basin, dominated by Hongyan hilly landform and hilly topography. The main type of geomorphology is hills. The annual average temperature is 18.2℃. In 2013, Yanfeng District had jurisdiction over 2 townships and 6 streets, with a GDP of 18.1 billion yuan in 2013. In 2015, Yanfeng District township division adjustment, under the jurisdiction of 6 streets.
Airport In Yanfeng District - Hengyang Nanyue Airport
Hengyang Nanyue Airport (Hengyang Nanyue Airport, IATA: HNY, ICAO: ZGHY) is located in Hengnan County, Hengyang City, Hunan Province, China, about 24 kilometers away from Hengyang City. Mid-South Regional Aviation Center   .
On February 22, 2012, the Development and Reform Commission of the People's Republic of China passed the feasibility study report of Hengyang Nanyue Airport, and it was officially opened to navigation on December 23, 2014, named Hengyang Nanyue Airport   .
As of December 2014, Hengyang Nanyue Airport has a terminal building of T1 (domestic in China) with a total area of ​​14,300 square meters; a runway with a length of 2,600 meters; an apron of 31,000 square meters and 11 seats   . [twenty two]  As of January 2019, a total of 21 routes have been opened, covering 29 cities   .
In 2019, the passenger throughput of Hengyang Nanyue Airport was 1.1029 million passengers, a year-on-year increase of 35.1%; the cargo and mail throughput was 1,300 tons, a year-on-year increase of 65.6%; 114th and 124th   .
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