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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.

Changhai County, under the jurisdiction of Dalian City, Liaoning Province, is located in the Changshan Islands and belongs to the extension of Changbai Mountain Mountains. It belongs to the warm temperate semi-humid monsoon climate, with four distinct seasons, warm in winter and cool in summer, sufficient sunshine and small temperature difference; the total land area is 142.04 square kilometers, and it has jurisdiction over 5 towns; it has a registered population of 71226 in 2018. Changhai County is the only island county in Northeast China and the only island border county in the country. It is located in the northern part of the Yellow Sea to the east of the Liaodong Peninsula, opposite to the Korean Peninsula in the east, opposite to the Miaodao Islands in Shandong Province in the southwest, and adjacent to the urban areas of Dalian, Pulandian City and Zhuanghe City in the west and north. It is the nearest area to Japan and South Korea in the northeast. In November 2018, Changhai County was selected into the national "Happiness 100 Counties list". In 2018, Changhai County achieved a GDP of 9.45 billion.
Airport In Changhai County - Dalian Zhoushuizi International Airport
Dalian Zhoushuizi International Airport (Dalian Zhoushuizi International Airport, IATA: DLC, ICAO: ZYTL), located in Ganjingzi District, Dalian City, Liaoning Province, China, is a 4E-level civil transport airport. One of the important airports, it is a national first-class civil international airport, a major domestic trunk line airport and an international scheduled flight airport.    
Dalian Zhoushuizi International Airport was opened to traffic on October 6, 1972. In 1984, 1992, 1999 and 2005, the airport was expanded and upgraded successively.   On September 6, 2011, the third-phase terminal building of the airport was completed and put into use, and the annual passenger handling capacity of the airport rose to 16 million to 20 million passengers.  
According to the official website of Dalian Zhoushuizi International Airport in November 2017, the airport covers an area of ​​3.45 million square meters and has a 3300-meter-long runway; the area of ​​the apron is 660,000 square meters, and there are 42 parking spaces (including 18 corridor bridges); The total area of ​​the terminal building is 135,000 square meters; a total of 88 cities and 146 domestic and overseas routes have been opened.  
In 2016, the passenger throughput of Dalian Zhoushuizi International Airport was 15,258,200 passengers, a year-on-year increase of 7.8%, exceeding 15 million passengers for the first time.  
In 2017, the passenger throughput of Dalian Zhoushuizi International Airport was 17.5 million, a year-on-year increase of 14.7%, the largest increase since 2014. The cargo and mail throughput was 166,000 tons, a year-on-year increase of 12.1%; the number of takeoffs and landings was 141,000, a year-on-year increase of 10.7%; they ranked 23rd, 17th, and 21st in mainland China respectively.
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