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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.

Caidian District, subordinate to Wuhan City, Hubei Province, is located in the western suburb of Wuhan City, located in the triangle zone of the confluence of the Han River and the Yangtze River, in the east of the Jianghan Plain, near the Han River in the north, and dependent on the lips and teeth of the East and West Lake District; facing the Tongshun River in the south, connected by mountains and rivers in Hannan District; bordering the Yangtze River in the east and facing Jiangxia District across the water; bordering Hanchuan City in the west; Hanyang District in the northeast; Xiantao City in the southwest. It is between 113o 41mm east longitude and 114o 13' north latitude, with a total area of 1093.57 square kilometers. By 2018, Caidian District had jurisdiction over 12 streets and 1 township, and had 4 management committees with a resident population of 466600, realizing a GDP of 47.607 billion yuan, of which the added value of the primary industry was 4.298 billion yuan.
Airport In Caidian District - Wuhan Tianhe International Airport
Wuhan Tianhe International Airport (Wuhan Tianhe International Airport, IATA: WUH, ICAO: ZHHH), located in Huangpi District, Wuhan City, Hubei Province, China, 25 kilometers away from the center of Wuhan, is the first 4F civil international airport in central China   , one of the eight major regional hub airports in China, an airport with international scheduled flights, and a first-class air port open to the outside world   . In January 2019, the airport began to implement a 144-hour transit visa-free policy.
The field was officially completed and open to navigation on April 15, 1995, named "Wuhan Tianhe Airport"; it was identified as an international airport in 2000; the second phase of the expansion project was completed in April 2008. The third-phase expansion project was substantially started in June 2013, passed the completion acceptance in June 2017, and passed the industry acceptance in August 2017 and put into use.  
As of August 2020, Wuhan Tianhe International Airport has 1 terminal building with a total area of ​​495,000 square meters; 2 runways with lengths of 3,400 meters and 3,600 meters respectively; a total of 117 seats, and an air cargo terminal of 56,042 square meters meters; it can meet the needs of annual passenger throughput of 35 million person-times, cargo and mail throughput of 440,000 tons, and aircraft take-off and landing of 404,000 sorties.   
In 2019, the passenger throughput of Wuhan Tianhe International Airport was 27.15 million, a year-on-year increase of 10.8%; the cargo and mail throughput was 243,000 tons, a year-on-year increase of 9.8%; the number of transportation movements was 203,000, a year-on-year increase of 8.2%.  
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