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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.

Pidu District is located in the northwest of Chengdu City, Sichuan Province, bordering Pengzhou and Xindu District in the northeast, Jinniu District in the southeast, Qingyang District in the south, Wenjiang District in the southwest and Dujiangyan City in the northwest. It is the birthplace of farm music tourism in Sichuan Province, China, known as the hometown of Douban, the hometown of Shu embroidery and bonsai; it is the "electronic information and mass entrepreneurship and innovation industrial base and international urban new area" that Chengdu City of Sichuan Province has built into a national central city. Pidu District has jurisdiction over 1 street and 13 towns, covering an area of 438 square kilometers; Chengdu High-tech Zone is entrusted to manage 2 streets, 43 square kilometers; it is located in the first self-flow irrigation district of Dujiangyan, ranking Shangfeng and Shangshui in Chengdu, Sichuan; to undertake more than 90% of drinking water supply in Chengdu. The terrain is flat, the land is fertile, the Baitiao River and other eight rivers in the territory
Airport In Pidu District - Chengdu Shuangliu International Airport
Chengdu Shuangliu International Airport (Chengdu Shuangliu International Airport, IATA: CTU, ICAO: ZUUU), located at the junction of Shuangliu District and Wuhou District, Chengdu City, Sichuan Province, China, about 16 kilometers northeast from the center of Chengdu, is a 4F international aviation hub , one of the eight major regional hub airports in China   , an aviation hub and passenger and cargo distribution center in China's inland areas.     
The predecessor of Chengdu Shuangliu International Airport is Chengdu Shuangguisi Airport, which was built in 1938. On December 12, 1956, Chengdu Shuangguisi Airport was renamed Chengdu Shuangliu Airport.   On November 30, 1995, Chengdu Shuangliu Airport was approved to change its name to Chengdu Shuangliu International Airport. On August 9, 2012, Terminal 2 of Chengdu Shuangliu International Airport officially opened.   
According to the information on the airport's official website in August 2017, the airport has 2 terminals with a waiting area of ​​500,000 square meters, which can meet the annual passenger throughput of 50 million passengers. There are 3 air cargo terminals and 2 parallel runways. , there are 3 aircraft parking areas with a total area of ​​9.4127 million square meters; a total of 228 parking spaces (as of January 2020)   ; 270 air routes have been opened, connecting 209 cities at home and abroad.  
In 2019, Chengdu Shuangliu International Airport handled a total of 55,858,552 passengers, a year-on-year increase of 5.5%, ranking fourth in the country; cargo and mail throughput was 671,903.9 tons, a year-on-year increase of 1.0%, ranking sixth in the country; aircraft movements were 366,887 Flights, a year-on-year increase of 4.2%, ranking fifth in the country   .
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