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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.

The newly-built district, under the jurisdiction of Nanchang City, Jiangxi Province, is located in the northwest of the central urban area of Nanchang City, Jiangxi Province. It is a "thousand-year-old city" with a gathering of humanities and is known as the "land of fish and rice". It is bordered by Ganjiang River in the east, Xishan in the west, Poyang Lake in the north and Fengcheng and Gao'an in the south. With the promotion of the development pattern of "both sides of the river" in Nanchang and the construction of Honggutan New area in Nanchang, the newly-built district has become a new urban area of Nanchang. The region covers an area of 2193.32 square kilometers, including 18 townships, 1 industrial park and 276 administrative villages. At the end of 2016, the total registered population was 692400, of which 192000 were urban residents. In 2018, the GDP of the newly built areas totaled 47.5 billion yuan, an increase of 9.0 percent.
Airport In Xinjian District - Nanchang Changbei International Airport
Nanchang Changbei International Airport (Nanchang Changbei International Airport, IATA: KHN, ICAO: ZSCN), located in Nanchang City, Jiangxi Province, China, about 28 kilometers away from Nanchang City, is a 4E-level civil transport airport.
Nanchang Changbei Airport started construction on October 20, 1996, and was completed and put into use on September 10, 1999. In February 2004, Nanchang Changbei Airport passed the inspection and acceptance of foreign aircraft and was promoted to an international airport. In 2006, the second phase of the reconstruction and expansion project of Nanchang Changbei International Airport broke ground and was put into use in 2009. On May 23, 2011, Terminal T2 of Nanchang Changbei International Airport was officially opened.
According to comprehensive information in November 2018, Nanchang Changbei International Airport has a T1 terminal building of 27,000 square meters, a T2 terminal building of 96,600 square meters, a runway of 3,400 meters, and 51 parking spaces, which can meet the needs of A330, B777, B747 and other Full-weight take-off and landing of large, medium and large passenger aircraft.
In 2017, Nanchang Airport completed a passenger throughput of 10.93 million passengers, a year-on-year increase of 39.0%, with a net increase of 3.07 million passenger throughput; 89,000 flights took off and landed, a year-on-year increase of 35.2%; cargo and mail throughput was 52,000 tons, a year-on-year increase of 33,000 %; respectively ranked 31st, 35th and 34th in China.  
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