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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.

Jiutai District, one of the municipal districts of Changchun City, the capital of Jilin Province, is located in the middle of Jilin Province, bordering Erdao District and Shuangyang District of Changchun City in the west, Changyi District and Yongji County in the east. It is the east gate of Changchun and the green ecological barrier in the east of Changchun. Ha Chang-Changji Great Cross Strategic Axis Node City The important node of "Belt and Road Initiative" strategy, the supporting hinterland of Changjitu development and opening pilot area, the joint hub of Changji integrated metropolitan area, and the most important core area of Changchun New area of national new area. Jiutai District is known as "Pearl of Jilin Hinterland" and "City of Fengzhu". It is known as "hometown of Chinese shaman culture", "hometown of Manchu paper-cut art", "hometown of Chinese falconry culture" and "hometown of northern seedlings and flowers". National rural financial reform experimental area, national sustainable development experimental area, national intellectual property
Airport In Jiutai District - Changchun Longjia International Airport
Changchun Longjia International Airport (Changchun Longjia International Airport, IATA: CGQ, ICAO: ZYCC), located at the junction of Donghu Town and Longjia Town, Jiutai District, Changchun City, Jilin Province, China, about 32 kilometers southwest of Changchun city center and southeast About 76 kilometers away from the center of Jilin, it is a 4E-level international trunk airport, an international regional hub in Northeast Asia, and a freight distribution center for China and Europe   .
On May 29, 2003, Changchun Longjiahu Airport officially started construction; on July 15, 2005, Changchun Longjiahu Airport was renamed "Changchun Longjia International Airport"; on August 27, 2005, Changchun Longjia International Airport officially Open to aviation, Changchun Dafangshen Airport and Jilin Ertaizi Airport have been transferred to this location for overall civil aviation operations   .
As of February 2021, Changchun Longjia International Airport has 2 terminals with a total construction area of ​​204,000 square meters; the civil aviation station has 61 aircraft seats, including 32 near aircraft seats; the runway is 3,200 meters long and 45 meters wide ; It can meet the needs of annual passenger throughput of 16 million passengers   .
In 2020, the passenger throughput of Changchun Longjia International Airport was 9.360541 million passengers, a year-on-year decrease of 32.8%, ranking 29th in the country; the cargo and mail throughput was 83,672 tons, a year-on-year decrease of 5.9%, ranking 32nd in the country; the number of aircraft movements was 75,510 Flights, down 23.6% year-on-year, ranking 37th in the country   .
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