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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.

Donghai County is located in the northeast of Jiangsu Province, under the jurisdiction of Lianyungang City, located at 34 °11 °N, 34 °44 °N, 118 °23 °E, 119 °10'E. It is bordered by Linshu County of Shandong Province in the north, Shuyang County in the south, Xinyi City in the west, Haizhou District of Lianyungang City in the east, Malingshan and Tancheng County in Shandong Province in the northwest, and Ganyu District of Lianyungang City in the northeast along the Xinshu River. Donghai County has a total area of 2037 square kilometers. Donghai County gives full play to its own advantages, centering on the goal of "Building a Happy East China Sea", comprehensively speeds up scientific development, green development, and innovative development, and its comprehensive strength has been continuously improved. successively won the national agricultural comprehensive strength 100 counties, the national grain production advanced county six consecutive championships, the national scientific and technological progress assessment advanced county four consecutive championships, China's most investment
Airport In Donghai County - Lianyungang Huaguoshan Airport
Lianyungang Huaguoshan Airport (Lianyungang Huaguoshan Airport, IATA: LYG, ICAO: ZSLG), is located in Xiaoyi Town, Guanyun County, Lianyungang City, Jiangsu Province, China. It is 21.5 kilometers away from the center of Lianyungang in the north and about 15 kilometers away from the center of Guanyun County in the south. It is about 50 kilometers away from Lianyungang Baitabu Airport in the northwest; it is a 4D-level international civil transport airport, a large trunk airport in Jiangsu Province, a national first-class air port, and an international shipping center in northern Jiangsu     .
On January 27, 2018, the relocation project of Lianyungang Civil Airport was approved.   ; On February 12, 2019, Lianyungang Huaguoshan Airport started construction   ; On December 2, 2021, Lianyungang Civil Aviation will be relocated from Lianyungang Baitabu Airport to Lianyungang Huaguoshan Airport for operation         .
As of January 2019, the terminal building of Lianyungang Huaguoshan Airport has a construction area of ​​30,000 square meters. It has a runway with a length of 2,800 meters and a width of 45 meters. There is also a parallel taxiway and 5 vertical connecting taxiways; It can meet the needs of annual passenger throughput of 2.5 million person-times, cargo and mail throughput of 24,000 tons, and aircraft take-off and landing of 25,000 sorties   .
In 2021, Lianyungang Huaguoshan Airport will handle 1,233,272 passengers, a year-on-year increase of 27.8%, ranking 88th in the country; cargo and mail throughput will be 8,415.6 tons, a year-on-year increase of 344.4%, ranking 63rd in the country; aircraft movements will reach 15,116 Flights, a year-on-year increase of 27.8%, ranking 105th in the country   .
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