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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.

Changyi City is a county-level city under the jurisdiction of Weifang City. it is located in the northwest of Shandong Peninsula, downstream of Weihe River, on the bank of Laizhou Bay, between 36 °25 degrees north latitude, 37 °08 degrees north latitude and 119 °13 degrees east longitude. Pingdu County is bounded by Jiaolai River in the east, Gaomi County and Anqiu County in the south, Fangzi District and Hanting District in Weifang City in the west, and Laizhou Bay in the north, with a total urban area of 1578.7 square kilometers. As of 2016, Changyi has jurisdiction over 3 streets and 6 towns. In 2015, Changyi had a total population of 585000. In 2016, the city's GDP reached 40 billion yuan, and the per capita disposable income in urban and rural areas reached 31000 yuan and 16000 yuan, respectively. Changyi belongs to the economic circle around the Bohai Sea, which is the coastal external area determined by the State Council.
Airport In ChangYi - Weifang Airport
Weifang Nanyuan Airport (Weifang Nanyuan Airport, IATA: WEF, ICAO: ZSWF), located at No. 1 Airport Road (Nanyuan Street), Kuiwen District, Weifang City, Shandong Province, China, 8 kilometers north of Weifang City Center, is a 4D-level military and civilian shared feeder airport   .
On April 4, 1996, Weifang Nanyuan Airport officially opened civil aviation business; on April 19, 2004, HNA Group Weifang Nanyuan Airport Co., Ltd. was unveiled; on August 3, 2015, Weifang Nanyuan Airport's air port temporarily open   .
As of April 2020, the terminal area of ​​Weifang Nanyuan Airport is 19,182 square meters, with 1 boarding bridge; the civil aviation station area is 34,000 square meters, with 6 civil aviation seats, including 2 class D seats, 4 C-class seats; the runway is 2,600 meters long and 48 meters wide; it can meet the needs of an annual passenger throughput of 320,000 passengers     .
In 2021, Weifang Nanyuan Airport will handle a total of 680,077 passengers, a year-on-year increase of 39.7%, ranking 113th in the country; cargo and mail throughput will be 31,820.1 tons, a year-on-year decrease of 1.5%, ranking 46th in the country; aircraft take-offs and landings will be 8,710 , a year-on-year increase of 21.2%, ranking 133rd in the country   .
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