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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.

Jiading District, which belongs to Shanghai, is located in the northwest of Shanghai, with its center at 121o 26 east longitude & 31 °39-#39; north latitude of #39;,. It borders Baoshan and Putuo districts in the east, Kunshan City in Jiangsu Province in the west, Wusong River in the south, Minhang, Changning and Qingpu districts in the south, and Taicang City in Jiangsu Province in the north. The total area is 463.55 square kilometers. The whole territory of Jiading District is flat, slightly higher in the northeast and slightly lower in the southwest. The municipal and district-level rivers of Miao Bang, Lianqi River and Loutang River lie from east to west and flow eastward through Baoshan District to the Yangtze River and Huangpu River. Yantietang, Hengli and Xinhuanpu (Luohe River) run from north to south, connecting with Wusong River and Liuhe River. The water area rate of the whole region is 7.71%. The total length of the river is more than 1800 kilometers. The average density of the river network is per square meter.
Airport In Jiading District - Shanghai Pudong International Airport
Shanghai Pudong International Airport (Shanghai Pudong International Airport, IATA code: PVG, ICAO code: ZSPD), located in Pudong New Area, Shanghai, China, about 30 kilometers away from the center of Shanghai, is a 4F civil airport and one of the three major portal complex hubs in China one   , members of the international air cargo hub group in the Yangtze River Delta region, and members of the East China Airport Group   , the largest hub airport and gateway airport in East China   .
Shanghai Pudong International Airport was completed in 1999. On September 16, 1999, the first phase of the project was completed and opened to navigation. On March 17, 2005, the second runway was officially opened. On March 26, 2008, the second terminal and the third runway were officially opened to navigation. Opening, the fourth runway was officially opened on March 28, 2015.
According to the information on the official website in September 2019, Pudong Airport has two terminals and a satellite hall, with a total area of ​​1.456 million square meters   , with 340 parking bays   ; There are four runways, 2 at 3800 meters, 1 at 3400 meters and 1 at 4000 meters.   As of the end of 2016, Pudong Airport has attracted 37 airlines to operate all-cargo aircraft business here, and the all-cargo aircrafts are available to 31 countries and 112 destinations, with nearly 1,000 all-cargo aircraft taking off and landing every week.  
In 2019, the annual passenger throughput of Pudong Airport was 76.1534 million passengers, the annual cargo and mail throughput was 3.6356 million tons, and the annual take-off and landing flights were 511,846. As of the end of 2017, 110 airlines have launched regular flights to the two major airports in Shanghai, and Pudong Airport is connected to 297 navigation points in 47 countries and regions around the world.  
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