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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.

Sansha City is one of the four prefecture-level cities in Hainan Province. Established in 2012 with the cancellation of the offices of the Xisha Islands, Nansha Islands and Zhongsha Islands in Hainan Province, it is located in the central and southern part of the South China Sea and Hainan Province, and has jurisdiction over the islands and reefs and sea areas of the Xisha Islands, Zhongsha Islands and Nansha Islands, with a total area of more than 2 million square kilometers, of which the land area is more than 20 square kilometers (including southwest sand-filled land). By 2015, Sansha City had jurisdiction over 4 administrative districts (work committee and management committee) and 10 communities, with a resident population of more than 2500 (excluding resident military and police) and a registered population of 448. The municipal government is stationed on Yongxing Island in Xisha. Sansha City is the southernmost prefecture-level administrative region in China, and it is also the city with the largest total area, the smallest land area and the least population.
Airport In Sansha - Sansha Yongxing Airport
Sansha Yongxing Airport (Sansha Yongxing Airport, IATA: XYI, ICAO: ZJYX), located in the southeast of Yongxing Island, Yongxing Town, Xisha District, Sansha City, Hainan Province, China, about 800 meters west of the Sansha Municipal People's Government, is a 4C-level military and civilian shared airport   .
In April 1991, the military Yongxing Island Airport was completed and opened to navigation; in 2012, Hainan Province applied to renovate and expand the Yongxing Island Airport into a military-civilian airport; on December 22, 2016, Sansha Yongxing Airport opened civil aviation business charter flights     .
As of December 2016, the terminal building of Sansha Yongxing Airport covers an area of ​​about 3,500 square meters, and the apron has 4 civil aviation parking stands; the airport runway is 3,000 meters long and 50 meters wide, and can take off and land aircraft below Boeing B737-800   ;Hainan Airlines has opened a total of 1 routes here   .
In 2021, Sansha Yongxing Airport will have a total annual passenger throughput of 36,405 passengers, a year-on-year increase of 85.0%, ranking 235th in the country; cargo and mail throughput of 200.2 tons, a year-on-year increase of 54.1%, ranking 170th in the country; sorties, a year-on-year increase of 88.1%, ranking 239th in the country   .
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