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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.

Yanji City belongs to Yanbian Korean Autonomous Prefecture of Jilin Province. Yanji City is the center of politics, economy, culture and foreign exchanges of the whole prefecture. It is located in the east of Jilin Province, the middle of Yanbian Prefecture, the northern foot of Changbai Mountain, the hinterland of Northeast Asia economic circle, and a fulcrum of the Tumen River "Golden Triangle" drawn up by the United Nations. It is only 60 kilometers away from the Sino-Russian border, 80 kilometers away from the Sea of Japan, and more than 10 kilometers away from the border between China and North Korea in the south. Yanji is a central city in the east of Jilin Province, an excellent tourist city in China and one of the top 100 counties in China. The comprehensive economic strength of Yanji county has always been in the first place in Jilin Province. The scenic spots in Yanji are: Maoershan National Forest Park, Chengzishan Mountain City site, Mengdu Beauty Folk Tourism Resort, Chunxing Village, Korean ancient village and so on. Yanji is listed as the first batch of national new urbanization.
Airport In Yanji - Yanji Chaoyangchuan International Airport
Yanji Chaoyangchuan International Airport (Yanji Chaoyangchuan International Airport, IATA: YNJ, ICAO: ZYYJ), located in Chaoyangchuan Town, Yanji City, Yanbian Korean Autonomous Prefecture, Jilin Province, is a 4C-level military-civilian airport.  
Yanji Chaoyangchuan International Airport was built in 1952. In 1985, with the approval of the State Council and the Central Military Commission, Yanji Chaoyangchuan Airport was converted into a military-civilian airport. On August 29, 1985, Yanji Chaoyangchuan Airport opened civil aviation routes. In December 1993, Yanji Chaoyangchuan Airport completed the flight area expansion project. In April 1997, the new terminal building project was completed. On June 9, 2017, it was approved by China Civil Approved by the Aviation Administration, the name was changed to Yanji Chaoyangchuan International Airport.   
As of April 2022, Yanji Chaoyangchuan International Airport has a terminal building with an area of ​​21,720 square meters, 4 covered bridges, 11 parking stands, and a 2,600-meter-long runway. It has 16 domestic and foreign waypoints, including 15 domestic waypoints and 1 foreign waypoint.   
In 2021, the passenger throughput of Yanji Chaoyangchuan International Airport will be 580,500, a year-on-year increase of 1.4%, ranking 123rd in the country; the cargo and mail throughput will be 3,691.1 tons, a year-on-year decrease of 1.3%, ranking 82nd in the country, with 6,087 take-offs and landings, A year-on-year increase of 6.0%.  
At 16:05 on October 30, 2022, the Chengdu Tianfu-Yantai-Yanji round-trip route was officially opened.  
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