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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.

Huancui District, which belongs to Weihai City, Shandong Province, is located at the easternmost end of Shandong Peninsula, surrounded by the sea on three sides, facing the Korean Peninsula and Japanese islands in the east, with a total area of 276.21 square kilometers and a coastline of about 43 kilometers. It is the city closest to China and South Korea in a straight line. Huancui District is the residence of Weihai government and the central city of Weihai. In the 31 year of Hongwu of the Ming Dynasty (1398), the Ming Dynasty set up guards and stationed troops here to prevent Japanese aggression, which was called Weihaiwei. By the end of 2018, Huancui District had jurisdiction over 5 streets and 3 towns with a resident population of 365800, achieving a GDP of 39.59 billion yuan, of which the added value of the primary industry, the secondary industry and the tertiary industry was 3.01 billion yuan, 14.897 billion yuan and 21.684 billion yuan, respectively.
Airport In Huancui Area - Weihai Dashuibo International Airport
Weihai Dashuibo International Airport (Weihai Dashuibo International Airport, IATA: WEH, ICAO: ZSWH), located in Weihai City, Shandong Province, China, about 40 kilometers away from the center of Weihai, is a 4D-level military-civilian airport    .
Weihai Dashuibo Airport was completed and opened to navigation; on October 30, 1995, Weihai Dashuibo Airport was upgraded to a 4D-level airport; on September 30, 2004, Weihai Dashuibo Airport was approved to open to the public, and then changed its name to "Weihai Dashui Park International Airport"   .
As of December 14, 2016, Weihai Dashuibo International Airport has a runway of 2,600 meters, an apron construction area of ​​36,000 square meters, a terminal building of 14,000 square meters, and an air traffic control building of 1,700 square meters. The designed passenger throughput capacity of the airport is 1.4 million person-times/year, of which the international passenger volume is 500,000 person-times/year, and the cargo capacity is 50,000 tons/year   .
In 2019, the passenger throughput of Weihai Dashuibo International Airport completed 3 million passengers, a year-on-year increase of 23%, ranking 60th in the country; the cargo and mail throughput was 9,228.081 tons, a year-on-year increase of 36.4%, ranking 77th in the country; flight movements were 25,694 Flights, a year-on-year increase of 23.0%   .
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