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Chicago (/ʃɪˈkɑːɡoʊ/ (listen) shih-KAH-goh, locally also /ʃɪˈkɔːɡoʊ/ shih-KAW-goh) is the most populous city in the U.S. state of Illinois and the third-most populous in the United States, after New York City and Los Angeles. With a population of 2,746,388 in the 2020 census, it is also the most populous city in the Midwest. As the seat of Cook County (the second-most populous U.S. county), the city is the center of the Chicago metropolitan area, one of the largest in the world.

On the shore of Lake Michigan, Chicago was incorporated as a city in 1837 near a portage between the Great Lakes and the Mississippi River watershed. It grew rapidly in the mid-19th century; by 1860, Chicago was the youngest U.S. city to exceed a population of 100,000. The Great Chicago Fire in 1871 destroyed several square miles and left more than 100,000 homeless, but Chicago's population continued to grow to 503,000 by 1880 and then doubled to more than a million within the decade. The construction boom accelerated population growth throughout the following decades, and by 1900, less than 30 years after the fire, Chicago was the fifth-largest city in the world. Chicago made noted contributions to urban planning and zoning standards, including new construction styles (such as, Chicago School architecture, the development of the City Beautiful Movement, and the steel-framed skyscraper).

Chicago is an international hub for finance, culture, commerce, industry, education, technology, telecommunications, and transportation. It is the site of the creation of the first standardized futures contracts, issued by the Chicago Board of Trade, which today is part of the largest and most diverse derivatives market in the world, generating 20% of all volume in commodities and financial futures alone. O'Hare International Airport is routinely ranked among the world's top six busiest airports according to tracked data by the Airports Council International. The region also has the largest number of federal highways and is the nation's railroad hub. The Chicago area has one of the highest gross domestic products (GDP) in the world, generating $689 billion in 2018. The economy of Chicago is diverse, with no single industry employing more than 14% of the workforce. It is home to several Fortune 500 companies, including Archer Daniels Midland, Conagra Brands, Exelon, JLL, Kraft Heinz, McDonald's, Mondelez International, Motorola Solutions, Sears, and United Airlines Holdings.

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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