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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.

Huangdao District, also known as Qingdao West Coast New area, is not only a municipal district of Qingdao, but also the ninth national new area of the people's Republic of China. Huangdao District is a national land and sea development pilot area, an international high-end marine industry agglomeration area, a demonstration zone for international cooperation in marine economy, an international shipping hub and a blue economy pilot zone in Shandong Peninsula. Among them, 6 streets in the north and Wangtai (including Huangshan Economic Zone) and Lingshanwei subdistrict office (including Jimiya Port area) are the first batch of Qingdao Economic and technological Development Zone approved by the State Council. Qingdao Qianwan bonded Port area and Dongjiakou Port area are located in Huangdao District. In 2012, the original Huangdao District and Jiaonan City of Qingdao were abolished, and a new Huangdao District of Qingdao was established. The West Coast Economic New Zone of Qingdao was established in 2014, including the whole of Huangdao District.
Airport In Huangdao district - Qingdao Jiaodong International Airport
Qingdao Jiaodong International Airport (Qingdao Jiaodong International Airport, IATA: TAO, ICAO: ZSQD), located in Qiandiankou Village, Jiaodong Street, Jiaozhou City, Qingdao City, Shandong Province, China, 11 kilometers southwest of Jiaozhou city center and 39 kilometers southeast of Qingdao city center It is 28 kilometers away from Qingdao Liuting International Airport (disused) in the southeast and 6 kilometers away from Jiaozhou Airport of the Navy in the west (relocated). It is a 4F international airport, a regional hub airport, and a gateway airport for Japan and South Korea       .
On June 26, 2015, the foundation stone of Qingdao New Airport project started; on November 21, 2018, Qingdao New Airport was named "Qingdao Jiaodong International Airport"   ; On January 27, 2021, the test flight of Qingdao Jiaodong International Airport was successful [twenty two]  ; On August 12, 2021, Qingdao Jiaodong International Airport will officially open to traffic   .
As of August 2021, the terminal area of ​​Qingdao Jiaodong International Airport is 540,000 square meters, with 97 boarding bridges; there are 173 aircraft seats on the civil aviation platform, of which 5 are F-class aircraft seats; The distance from the runway is 3,600 meters long, and the width is 45 meters and 60 meters respectively; it can meet the use requirements of 35 million passenger throughput, 500,000 tons of cargo and mail throughput, and 298,000 aircraft movements in 2025     .
In September 2021, Qingdao Jiaodong International Airport completed a total passenger throughput of 1,137,401 passengers, ranking fourth in East China; cargo throughput of 20,404 tons, ranking fifth in East China; aircraft movements of 12,094, ranking first in East China 4   .
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