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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.

Donggang District belongs to Rizhao City, Shandong Province. Bordering the Yellow Sea, it is located in the middle of the Chinese mainland coastline, with the south wing of Shandong Peninsula, Qingdao to the north and Lianyungang to the south, facing Japan and South Korea across the sea. The total area is 1507 square kilometers. Donggang District, founded in December 1992, is the resident area and main urban area of Rizhao City. It is located at the confluence of the coastal main axis developed by the state and the economic belt along the new Eurasian Continental Bridge, and the combination of the economic circle around the Yellow Sea and Bohai Sea and the economic circle of the Yangtze River Delta. It is an important node city of the national "Belt and Road Initiative" strategic planning and the "two zones, one circle" strategy of Shandong Province. In 2018, Donggang District has jurisdiction over 5 streets and 7 towns, with a total registered population of 741800, with a gross domestic product (GDP) of 57.04 billion yuan, of which the primary industry is realized.
Airport In Donggang Area - Rizhao Shanzihe Airport
Rizhao Shanzihe Airport (IATA: RIZ, ICAO: ZSRZ) is referred to as Rizhao Airport; it is located in Shanzihe, Houcun Town, Donggang District, Rizhao City, Shandong Province, China, 19 kilometers away from the center of Rizhao.  
Rizhao Shanzihe Airport was officially opened to navigation on December 22, 2015, and was named Rizhao Shanzihe Airport.  
According to the information on the airport's official website in March 2019, Rizhao Shanzihe Airport has a terminal building, T1 (domestic and international in China), with a total area of ​​22,000 square meters; a runway with a length of 2,600 meters; and 6 parking spaces , Cargo flat 3789 square meters   ; It can guarantee an annual passenger throughput of 900,000 person-times, a cargo and mail throughput of 4,500 tons, and an aircraft take-off and landing of 10,000 sorties   ;As of October 2019, Rizhao Shanzihe Airport has opened a total of 15 domestic routes in China and 21 navigable cities   .
In 2018, the passenger throughput of Rizhao Shanzihe Airport was 901,200 passengers, a year-on-year increase of 22.2%; the cargo and mail throughput was 1,400 tons, a year-on-year increase of 41.1%; the number of takeoffs and landings was 79,500 vehicles, a year-on-year increase of 83.4%; 101st, 99th, 44th.  
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