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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.

Jiuzhaigou County, which belongs to Aba Tibetan and Qiang Autonomous Prefecture in Sichuan Province, is located on the eastern edge of the Qinghai-Tibet Plateau and northeast of Aba Prefecture. It is bordered by Wen County, Zhouqu County and Diebu County in Gansu Province to the east and north, and Ruoergai County, Pingwu County and Songpan County in Sichuan Province to the west and south. The total area is 5288 square kilometers. The topography of Jiuzhaigou County is high in the northwest and southwest and low in the southeast. It belongs to the humid climate of the plateau. Jiuzhaigou, which has won three international laurels of "World Natural Heritage", "World Biosphere Reserve" and "Green Global 21" and the first batch of national 5A scenic spots, there are also provincial Wujiao Giant Panda Nature Reserve, Baihe Golden Monkey Nature Reserve, Gongleiling Nature Reserve, Ganhaizi National Forest Park and Shenxianchi Scenic spot, Jiamu Tianchi, Heihe Scenic Belt, Yuwashi Red Leaf Scenic spot,
Airport In Jiuzhaigou - Jiuzhai Huanglong Airport
Jiuzhai Huanglong Airport (Jiuzhai Huanglong Airport, IATA: JZH, ICAO: ZUJZ), commonly known as Jiuhuang Airport, is located about 12 kilometers north of Chuanzhusi Town, Songpan County, Aba Tibetan and Qiang Autonomous Prefecture, Sichuan Province, China, and 88 kilometers north of Jiuzhaigou Scenic Area , 43 kilometers east of Huanglong, is a 4D-level tourist feeder airport and a first-class high-altitude airport (3447.65 meters)   .
On September 26, 2003, Jiuzhai Huanglong Airport was completed and opened to navigation; from August 8, 2017 to April 18, 2018, Jiuzhai Huanglong Airport was suspended due to the earthquake; on December 4, 2019, Jiuzhai Huanglong Airport's aviation port construction Project started    .
According to the official website of Air China in 2020, Jiuzhai Huanglong Airport has 2 terminals with an area of ​​20,000 square meters; T1 has 3 boarding bridges, and T2 has 4 boarding bridges; There are 12 aircraft seats on the flat, including 5 D-class seats and 7 C-class seats; the runway is 3,400 meters long and 45 meters wide; it can meet the annual passenger throughput of 2.5 million passengers, cargo and mail throughput of 2,250 tons, and Reduce the use demand of 25080 sorties   .
In 2021, Jiuzhai Huanglong Airport will handle a total of 150,029 passengers, a year-on-year increase of 22.6%, ranking 201st in the country; cargo and mail throughput will be 16.9 tons, a year-on-year decrease of 87.0%, ranking 207th in the country; aircraft takeoffs and landings will be 2,222, Year-on-year growth of 41.3%, ranking 204th in the country   .
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