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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.

Nandan County is located in the northwest of Guangxi, at the southern foot of the Yunnan-Guizhou Plateau. It is located between longitude 107 °1'to 55'E and latitude 24 °42'N to 25 °37'. To the north of the Tropic of Cancer, it belongs to Zone 7 of the world time zone, which is one time zone west of Beijing time and one hour later than Beijing District. It faces Huanjiang County in the east, Jinchengjiang District in the south and southeast, Donglan in the southwest, Tianye County in the west, and Luodian, Pingtang, Dushan and Libo counties in Qiannan Prefecture of Guizhou Province on the north, northwest and northeast. The whole terrain of the county is narrow and long, with a maximum horizontal distance of 72km from east to west and a maximum vertical distance of 106km from north to south, with a total area of 3916.62 square kilometers. In 2006 and 2007, Nandan was awarded "Top Ten Counties for County Economic Development in Guangxi" for two consecutive years. Nandan is Guang
Airport In nandan county - Hechi Jinchengjiang Airport
Hechi Jinchengjiang Airport (Hechi Jinchengjiang Airport, IATA: HCJ, ICAO: ZGHC), located at the junction of Hechi Town, Jinchengjiang District, Hechi City, Guangxi Zhuang Autonomous Region, China and Chehe Town, Nandan County, the straight-line distance from the center of Hechi to the southeast is 40 km, which is a 4C-level domestic feeder airport in China   .
Hechi Jinchengjiang Airport started construction on December 3, 2008, completed the test flight on December 25, 2013, and officially opened to air on August 28, 2014   .
According to the official website of the airport in February 2020, Hechi Jinchengjiang Airport has a terminal area of ​​4,621 square meters, a runway of 2,200 meters long, a station area of ​​14,400 square meters, and 3 seats, including 2 Class B and 1 Class C.   .
In 2019, Hechi Jinchengjiang Airport handled a total of 20,963 passengers, a year-on-year decrease of 6.6%, ranking 232nd in the country; aircraft took off and landed 650 sorties, a year-on-year increase of 14.6%, ranking 233rd in the country   .
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