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  • Hekou District

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.

Hekou District, Dongying City area, located in the north of Shandong Province, north of the Yellow River estuary, is a typical Yellow River Delta geomorphology, high in the south and low in the north, high in the west and low in the east, with a warm temperate monsoon continental climate; it has jurisdiction over 2 streets and 4 towns with a total area of 2267.44 square kilometers and a registered household population of 220258 in 2017. Most of the estuarine areas are retreated to the sea. At the beginning of the Ming Dynasty, from the ocean shop of the Tu Hai River in the ancient river, and from the Daqing River in Jishui to the north of Tiemenguan in Lijin, it extended to the formation of territory and land. From time to time, salt people, fishermen and waterway merchants from other places flow back and forth. Residents began to appear in the decade of Daoguang of the Qing Dynasty (1830). The Qing Dynasty belongs to Zhongxin Township, Zhanhua County, Wuding Prefecture and Yonghe Township, Lijin County. In 2017, the gross domestic product (GDP) of the estuary reached 291.
Airport In Hekou District - Dongying Shengli Airport
Dongying Shengli Airport (Dongying Shengli Airport, IATA: DOY, ICAO: ZSDY), located in Shangfei Avenue, Yongan Town, Kenli District, Dongying City, Shandong Province, China, is 12.5 kilometers away from Dongying Municipal People's Government and Laizhou Bay. It is a 4D-level domestic airport. Regional Airport, COMAC Dongying Civil Aircraft Test Flight Base   .
On November 28, 2001, Dongying Yongan Airport officially resumed flights; on January 15, 2011, Dongying Yongan Airport was renamed Dongying Shengli Airport   ; On February 1, 2018, the 3600-meter runway of Dongying Shengli Airport was opened   .
As of January 2022, the terminal building of Dongying Shengli Airport has an area of ​​25,400 square meters, with 4 boarding bridges; there are 7 aircraft seats on the civil aviation platform, including 6 class C seats and 1 class D seat ;The length of the runway is 3,600 meters and the width is 45 meters; it can meet the needs of annual passenger throughput of 1 million passengers and cargo throughput of 5,000 tons   [twenty one]    .
In 2021, Dongying Shengli Airport will handle a total of 682,129 passengers, a year-on-year increase of 49.8%, ranking 112th in the country; cargo and mail throughput will be 705.2 tons, a year-on-year increase of 8.7%, ranking 134th in the country; aircraft movements will be 31,569 , a year-on-year decrease of 21.15%, ranking 73rd in the country   .
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