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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.

Mashan District, which belongs to Jixi City, Heilongjiang Province, is located 59 kilometers west of the central area of Jixi City, connected with Didao District in the northeast, Lishu District in the southeast, Muling City in the south and Linkou County in the west. The total population of the region is 38000 (2014), including 20, 000 in cities and towns and 18000 in rural areas. Mashan District has a total area of 425 square kilometers. The whole district has jurisdiction over 1 township and 1 street. From January to June 2014, the region's GDP reached 167.8 million yuan, down 3.4 percent from the same period in 2013.
Airport In Mashan District - Jixi Xingkai Lake Airport
Jixi Xingkaihu Airport (Jixi Xingkaihu Airport, IATA: JXA, ICAO: ZYJX), located on National Highway 311, Chengjia Village, Hada Town, Jidong County, Jixi City, Heilongjiang Province, China, 16 kilometers west of Jixi city center and south of Jidong County 6 kilometers away, it is a 4C-level domestic feeder airport in China   .
On October 15, 2007, the construction of Jixi Xingkaihu Airport started; on October 9, 2009, the test flight of Jixi Xingkaihu Airport was successful; on October 16, 2009, Jixi Xingkaihu Airport officially opened to navigation   ; On October 14, 2021, the 2800-meter runway test flight of Jixi Xingkaihu Airport was successful [twenty two]  .
As of January 2022, the terminal building of Jixi Xingkai Lake Airport has an area of ​​17,676.75 square meters, with 3 boarding bridges and 10 C-class seats on the civil aviation apron; the runway is 2,800 meters long and 45 meters wide; Passenger throughput of 650,000 passengers and cargo and mail throughput of 1,500 tons   .
In 2021, Jixi Xingkai Lake Airport will handle a total of 252,422 passengers, a year-on-year increase of 15.9%, ranking 172nd in the country; cargo and mail throughput will be 226.1 tons, a year-on-year increase of 32.4%, ranking 168th in the country; Flights, a year-on-year increase of 16.4%, ranking 190th in the country   .
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