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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.

Hohhot, commonly known as Hohhot, formerly known as Guisui, is the capital of Inner Mongolia Autonomous region, the political, economic and cultural center of Inner Mongolia, and an important central city in the border areas of northern China approved by the State Council. By 2018, the city had jurisdiction over four districts, four counties and one flag, with a total area of 17224 square kilometers, a built-up area of 260 square kilometers, a resident population of 3.126 million, and an urban population of 2.183 million, with an urbanization rate of 69.8%. Located in North China, the northern frontier and the interior of Eurasia, Hohhot is the core city of the Hubao silver urban agglomeration and the central city of the Hubao-Hubei urban agglomeration. it is an important bridge connecting the Yellow River economic belt, the Eurasian continental bridge and the economic region around the Bohai Sea. it is also an important open central city along the border that China opens to Mongolia and Russia.
Airport In Huhehaote、Huhehot - Hohhot Baita International Airport
Hohhot Baita International Airport (Hohhot Baita International Airport, IATA: HET; ICAO: ZBHH) is located on Airport Road, Saihan District, Hohhot, Inner Mongolia Autonomous Region, China; 14.3 kilometers away from the city center, it is a 4E-class civil international airport; it is the first in Inner Mongolia Autonomous Region big aviation hub   .
Hohhot Baita International Airport was officially completed and opened to navigation on October 1, 1958, named Hohhot Baita Airport; it was renamed Hohhot Baita International Airport on December 27, 2004; the first phase of the expansion project was completed on July 16, 1987; The second-phase expansion project was completed in July 1997; the third-phase expansion project was completed on July 28, 2007.  
According to the official website of the airport in October 2018, Hohhot Baita International Airport has a terminal building, T1 (domestic and international in China), with a total of 54,400 square meters; a runway with a length of 3,600 meters; 43 parking positions   ;A total of 124 domestic and international routes have been opened in China, covering 91 cities   .
In 2019, the passenger throughput of Hohhot Baita International Airport was 13.1518 million passengers, a year-on-year increase of 68.2%; the cargo and mail throughput was 46,100 tons, a year-on-year increase of 14.8%; the number of takeoffs and landings was 112,100, a year-on-year increase of 6.5%; 32nd, 41st, 32nd   .
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