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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.

Haikou, also known as "Coconut City", the capital of Hainan Province, the strategic fulcrum city of the national "Belt and Road Initiative", the core city of China (Hainan) Free Trade Experimental Zone (Hong Kong), located between 19 °31 °N, 20 °04 °N and 110 °42'E, located in the north of Hainan Island, Wenchang to the east, Chengmai to the west, Pidingan to the south, Qiongzhou Strait to the north, Hainan Province is the political, economic, scientific and technological, cultural center and the largest transportation hub in Hainan Province. Haikou is located in the tropics, with a variety of tropical resources, and is a southern coastal city rich in natural and beautiful seaside scenery. Since the opening of the port in the Northern Song Dynasty, it has a history of thousands of years. Haikou was founded on December 9, 1926 and liberated on April 23, 1950. On April 13, 1988, Hainan established a special economic zone.
Airport In Haikou - Haikou Meilan International Airport
Haikou Meilan International Airport (IATA: HAK, ICAO: ZJHK), located 18 kilometers southeast of Haikou City, Hainan Province, China, is an international airport and a regional aviation hub       , the permit specifies that the flight zone indicator is 4E, and the airport design flight zone indicator is 4F   .
Haikou Meilan International Airport officially opened to traffic on May 25, 1999; in December 2011, it became the first airport in China to have an outlying island duty-free shop; in January 2016, the first phase of the terminal building reconstruction and expansion project was completed; in November 2015, it began Phase II expansion project;   In April 2019, the main body of the second phase terminal of Haikou Meilan International Airport was basically completed   ; On June 1, 2020, the second phase of the expansion project will conduct its first school flight;   On December 2, 2021, the second phase of the airport project was officially put into operation.  
According to the official website of the airport in January 2022, Haikou Meilan International Airport covers an area of ​​1,140 hectares, with a station area of ​​1.2502 million square meters. It has a runway with a length of 3,600 meters and a width of 45 meters and a runway of 3,600 meters in length and width The runway; the total size of the terminal building is nearly 450,000 square meters, with 139 parking spaces.  
As of December 2, 2021, Haikou Meilan International Airport has opened 235 routes, including 225 domestic routes, 9 international cargo routes, and 1 regional cargo route. There are 122 cities in total, including 111 domestic cities and international cargo routes. There are 10 cargo navigation cities and 1 regional cargo navigation cities.  
As of December 2, 2021, the passenger throughput of Haikou Meilan International Airport reached 16.2108 million person-times; the number of flight movements reached 126,500; The throughput ranks 16th in the country.  
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