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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.

Dazu District, which belongs to Chongqing, was built in the first year of the Qianyuan Dynasty of the Tang Dynasty (AD 758). It is named after the meaning of "Dafeng Dazu". It is located in the west of Chongqing, 55 kilometers east of Chongqing and 155 kilometers west of Chengdu. Dazu District faces Tongnan District in the north, Tongliang District in the northeast, Yongchuan District in the southeast, Rongchang District in the southwest, and Anyue County in Sichuan in the northwest. It covers an area of 1436 square kilometers and has jurisdiction over 6 streets and 21 towns with a registered population of 1067861 (2017). In 2017, Dazu District achieved a GDP of 43.15 billion yuan, with a primary, secondary and tertiary industrial structure ratio of 10.7, 58 and 31.3. Dazu area is dominated by cars and motorcycles, intelligent manufacturing, modern hardware, modern home, electronic information, circular economy and so on. It has won the first batch of 5A scenic spots in the country.
Airport In DaZu District - Chongqing Jiangbei International Airport
Chongqing Jiangbei International Airport (Chongqing Jiangbei International Airport, IATA: CKG, ICAO: ZUCK), located in Lianglu Street, Yubei District, Chongqing, China, 19 kilometers from the city center, is a 4F civil international airport.   It is one of the eight major regional hub airports in China;    It is an air port that implements a 144-hour transit visa-free policy.  
Chongqing Jiangbei International Airport was officially completed and opened to traffic on January 22, 1990, and was named Chongqing Jiangbei Airport; it was renamed Chongqing Jiangbei International Airport in 1998; the second phase of expansion was completed in October 2005; the third phase of expansion was completed in December 2010; in 2017 The fourth phase of expansion was completed in August.      In November 2020, the T3B terminal and the fourth runway project officially started.  
According to information in May 2022, Chongqing Jiangbei International Airport has three terminal buildings, namely T1, T2 (domestic) and T3A (domestic and international), with a total of 737,000 square meters;   There are three runways with lengths of 3,200 meters, 3,600 meters, and 3,800 meters; the apron is 1.66 million square meters, with 209 seats,     The cargo area is 230,000 square meters; it can guarantee an annual passenger throughput of 45 million person-times, a cargo and mail throughput of 1.1 million tons, and an aircraft take-off and landing of 373,000 sorties.     As of the end of 2018, a total of 329 domestic and international routes have been opened, covering 203 cities.  
In 2021, Chongqing Jiangbei International Airport will handle 35.7663 million passengers, a year-on-year increase of 2.4%; cargo and mail throughput will be 476,700 tons, a year-on-year increase of 15.9%; aircraft movements will be 280,600, a year-on-year increase of 2.2%; 4. 8th and 6th.  
When the T3A terminal of Chongqing Jiangbei International Airport is opened, T1 will be suspended. Except the domestic flights of West Air, Sichuan Airlines, China Airlines, Spring Airlines, Jiuyuan Airlines, Guilin Airlines, Longjiang Airlines, Qingdao Airlines, Donghai Airlines, Changan Airlines, Suparna Airlines, and Lucky Air operate at T2   , and the rest of the airlines' flights will be moved to T3A.   In addition, the airport has opened a free shuttle bus that circulates between the three terminals.  
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