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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.

Taonan City, which belongs to Baicheng City, Jilin Province, is located in the northwest end of Jilin Province, southwest of Baicheng City. It is bordered by Daan City in the east, Tongyu County in the south, Tuquan County in Inner Mongolia Autonomous region in the west, Keerqin right-wing Qianqi in the north, and Taobei District in Baicheng City in the northeast. It shows an increasing trend from southeast to northwest, which belongs to the continental monsoon climate in the north temperate zone. Taonan under the jurisdiction of 8 streets, 6 towns, 10 townships, the municipal government resident Guangming Street. The total area is 5107 square kilometers, with a total population of 432000 in 2014. In 2017, Taonan City achieved a regional GDP of 14.6 billion yuan, an increase of 7.3% over the same period last year. Of this total, the added value of the primary industry was 2.613 billion yuan, up 4.5% over the same period last year; the added value of the secondary industry was 5.963 billion yuan, an increase of 8.9% over the same period last year; and the tertiary industry increased.
Airport In Taonan - Baicheng Chang'an Airport
Baicheng Chang'an Airport (BaiCheng ChangAn Airport, IATA: DBC, ICAO: ZYBA), located in Diaojiatun Airport Road, Taohe Town, Taobei District, Baicheng City, Jilin Province, China, 18.5 kilometers away from the center of Baicheng City in the northwest, is a 4C-level military-civilian regional airport   .
On October 26, 2012, the foundation stone of Baicheng Chang'an Airport was laid; on May 25, 2016, the test flight of Baicheng Chang'an Airport was successful; on March 31, 2017, Baicheng Chang'an Airport was officially open to navigation, and it was implemented for military and civilian use   .
As of February 2021, the terminal area of ​​Baicheng Chang'an Airport is 4,500 square meters, and the parking lot area is 4,000 square meters; there are 1 Class B seat and 3 Class C seats on the civil aviation station; the runway is 2,500 meters long and 45 meters wide ; It can meet the needs of annual passenger throughput of 200,000 passengers, cargo and mail throughput of 700 tons, and annual aircraft take-off and landing of 2,459 sorties      .
In 2020, Baicheng Chang'an Airport completed a total of 73,838 passenger throughput, a year-on-year increase of 13.3%, ranking 211th in the country; cargo and mail throughput was 1.2 tons, a year-on-year increase of 17.4%, ranking 221st in the country; aircraft took off and landed 1,594 sorties, Year-on-year growth of 120.8%, ranking 209th in the country   .
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