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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.

Shuangpai County, therefore known as Xianbo, was established in 1969 in Lingling, Daoxian and Ningyuan County. it is a county under the jurisdiction of Yongzhou City, Hunan Province. Shuangpai County, located in the south of Hunan Province, is located in the middle of Xiaoshui. National Highway 207, Yonglian Highway and Erguang Expressway run through the north and south. Shuangpai County, with a forest coverage rate of more than 80%, is a key forest county in the country. Shuangpai is rich in tourism resources and is a strong tourism county in Hunan Province. Yangmingshan National Forest Park and Shuangpai Reservoir Dam are located in Shuangpai County. In July 2019, he won the title of "China Natural oxygen Bar" in 2019.
Airport In Shuangpai - Yongzhou Lingling Airport
Yongzhou Lingling Airport (Yongzhou Lingling Airport, IATA: LLF, ICAO: ZGLG), referred to as "Yongzhou Airport", is located on Yingbin Road, Lanjiaoshan Street, Lengshuitan District, Yongzhou City, Hunan Province, China, 9.5 kilometers north of the urban area of ​​Lengshuitan District, 12.5 kilometers away from the urban area of ​​Lingling District in the south, it is a 4C-level naval military-civilian joint feeder airport and a first-level permanent military airport of the Chinese People's Liberation Army Naval Air Force   .
In October 1993, the Central Military Commission agreed that Lingling Caijiabu Airport should be used for both military and civilian use, and the civilian part was named "Yongzhou Lingling Airport"; on April 30, 2001, the civilian part of Yongzhou Lingling Airport was officially opened to navigation   ; On April 18, 2019, the runway of Yongzhou Lingling Airport was suspended for renovation   ; On January 31, 2021, Yongzhou Lingling Airport will resume flights   .
As of January 2021, the terminal area of ​​Yongzhou Lingling Airport is 4,705.8 square meters, and there are 6 C-class seats on the civil aviation apron; the runway is 2,600 meters long and 50 meters wide; it can guarantee an annual passenger throughput of 1.15 million passengers, aircraft The demand for take-off and landing of 30,000 sorties; the largest usable models are Boeing B737-800, Airbus A320-200, Airbus A321-200   .
In 2021, Yongzhou Lingling Airport will handle a total of 165,801 passengers, ranking 192nd in the country; cargo and mail throughput will be 3.2 tons, ranking 222nd in the country; aircraft take-offs and landings will be 1998, ranking 209th in the country   .
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