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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.

Yuanbao District, which belongs to Dandong City, Liaoning Province, is the central urban area of Dandong City, bordering the Yalu River in the southeast, facing Sinuizhou City in the Democratic people's Republic of Korea, adjoining Zhenan District along the foothills of Pandao Lingshan in the northwest, Zhenxing District in the southwest, and Jiulian Town in Zhenan District along the Aihe River in the northeast. At the end of 2011, Yuanbao District has jurisdiction over 6 streets, 1 town, 38 communities and 7 villages, the District people's Government is stationed at No. 8 Xinliu Street, with a total area of 91.6 square kilometers and a total population of 185900, including 13 ethnic groups such as Han and Manchu. In 2012, Yuanbao District achieved a GDP of 5.2 billion yuan, an increase of 14.7% over the same period in 2011.
Airport In Yuanbao District - Dandong Langtou Airport
Dandong Langtou Airport (Dandong Langtou Airport, IATA: DDG, ICAO: ZYDD), located on the east side of National Highway 201, Langtou Town, Zhenxing District, Dandong City, Liaoning Province, China, 6 kilometers east of Dandong city center, is a 4C-level military-civilian joint feeder airport   .
On December 21, 1985, Dandong Langtou Airport officially opened civil aviation services, and Donggou Qianyang Airport civil aviation was closed; on April 9, 2007, the air port of Dandong Langtou Airport was temporarily opened to the public; on April 17, 2014, Dandong Langtou Airport Singapore Airlines Station opening   .
According to the official website of Liaoning Provincial Airport Management Group Co., Ltd. in April 2020, the terminal area of ​​Dandong Langtou Airport is 20,780 square meters, with 2 boarding bridges; the civil aviation station area is 39,600 square meters, with 6 C-class aircraft seats ;The runway is 2,600 meters long and 45 meters wide; it can meet the needs of annual passenger throughput of 2 million passengers and cargo and mail throughput of 4,200 tons   .
In 2019, Dandong Langtou Airport completed a total of 259,048 passenger throughput, a year-on-year increase of 211.2%, ranking 179th in the country; cargo and mail throughput was 652.1 tons, a year-on-year increase of 50.9%, ranking 141st in the country; 2053 aircraft movements, Year-on-year growth of 187.1%, ranking 209th in the country   .
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