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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.

Qionghai, a county-level city in Hainan Province, is located in longitude 110 °7'5 "~ 40 °50 °quot; latitude 18 °58 °50 °quot; north latitude 18 °58 °35 °quot; It is located in the east of Hainan Province, the middle and lower reaches of Wanquan River, 78 kilometers north of Haikou City, 60 kilometers south of Wanning City, 163 kilometers of Sanya City, Dingan County and Tunchang County in the west, and Qinglan Port in Wenchang to the east. Qionghai has a total area of 1710 square kilometers. in 2016, Qionghai had a resident population of 506100, and about 550000 overseas Chinese, Chinese, and compatriots from Hong Kong, Macao and Taiwan, distributed in 28 countries and regions on five continents. The city has jurisdiction over 12 towns and the Bincun Mountain overseas Chinese Economic Zone, which also has three state-owned farms and one state-owned forest farm. In 2017, Qiong Haisheng
Airport In Qionghai City - Qionghai Boao Airport
Qionghai Boao Airport (Qionghai Boao Airport, IATA: BAR, ICAO: ZJQH), located in Zhongyuan Town, Qionghai City, Hainan Province, China, 12 kilometers away from Qionghai City, 15 kilometers away from Boao International Conference Center, the flight area level is 4C level is a key supporting project of the Boao Forum for Asia.  
Qionghai Boao Airport was officially opened to navigation on March 17, 2016, and was named Qionghai Boao Airport. In April 2016, the airport launched the second-phase expansion project; in March 2017, the second-phase expansion project of the airport was completed and accepted.  
According to the information on the airport's official website in January 2019, Qionghai Boao Airport has two terminals, China's domestic (9900 square meters) international and Hong Kong, Macao and Taiwan (6848 square meters), with a 3200-meter runway and 52 aircraft seats. The aircraft used are Boeing B737-800 and Airbus A320.    
In 2020, the passenger throughput of Qionghai Boao Airport was 562,900 passengers, a year-on-year increase of 0.7%; the cargo and mail throughput was 552.6 tons, a year-on-year increase of 3.6%; bit, 137th, 109th.  
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