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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.

Dongchang District, which belongs to Tonghua City, Jilin Province, is located in the urban center of Tonghua City, where the CPC Tonghua Municipal Committee and the people's Government of Tonghua City are located. It is located in the southeast of Jilin Province, with geographical coordinates between 125 °50 °E longitude 126 °07 °E and 41 °32 °N latitude 41 °49'. It is bordered by Erdaojiang District in the northeast, Ji'an City in the south, and Tonghua County in the west, northwest and southeast. In 2014, it covers an area of 382.6 square kilometers; it has jurisdiction over two townships, one town and seven streets; the total population is 315751 (2011); as of 2014, the GDP of Dongchang District was 14.5 billion yuan, an increase of 6.6 percent over 2013. Dongchang District has convenient transportation, with 303 National Highway, 201 National Highway and 202 National Highway as the main highway connecting the three northeastern provinces and entering the customs and going to the sea.
Airport In Dongchang District - Tonghua Sanyuanpu Airport
Tonghua Sanyuanpu Airport (Tonghua Sanyuanpu Airport, IATA: TNH, ICAO: ZYTN), located in Airport Road, Sanyuanpu Korean Town, Liuhe County, Tonghua City, Jilin Province, China, 41 kilometers southeast from the center of Tonghua, north from the county seat of Liuhe County 25.5 kilometers, a 4C-level military-civilian joint feeder airport (military and civil aviation fly in different fields)   .
On June 28, 2011, the construction of Tonghua Sanyuanpu Airport officially started; on December 4, 2013, the test flight of Tonghua Sanyuanpu Airport was successful; on June 18, 2014, Tonghua Sanyuanpu Airport officially opened for civil aviation business   .
According to the official website of the airport in April 2020, the terminal area of ​​Tonghua Sanyuanpu Airport is 3,034 square meters, and there are 4 seats on the civil aviation platform, including 3 class C seats and 1 class B seat; the runway is 2,300 meters long , 45 meters wide; can meet the annual passenger throughput of 194,000 person-times, cargo and mail throughput of 970 tons, and aircraft take-off and landing of 2,338 sorties.   .
In 2021, Tonghua Sanyuanpu Airport will handle a total of 127,603 passengers, a year-on-year increase of 29.2%, ranking 207th in the country; aircraft takeoffs and landings will reach 1,606, a year-on-year increase of 21.3%, ranking 221st in the country [twenty two]  .
From May 4, 2022, Tonghua Sanyuanpu Airport will be temporarily closed, and the specific resumption date will be adjusted in real time according to the construction progress [twenty one]  ; On July 1, the runway of Tonghua Airport has been closed for maintenance and reopened for use. [twenty four] 
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