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Tucson (/ˈtuːsɒn, tuːˈsɒn/; Spanish: Tucson, O'odham: Cuk-Ṣon) is a city in and the county seat of Pima County, Arizona, United States, and is home to the University of Arizona. It is the second largest city in Arizona behind Phoenix, with a population of 542,629 in the 2020 United States census, while the population of the entire Tucson metropolitan statistical area (MSA) is 1,043,433. The Tucson MSA forms part of the larger Tucson-Nogales combined statistical area (CSA). Both Tucson and Phoenix anchor the Arizona Sun Corridor. The city is 108 miles (174 km) southeast of Phoenix and 60 mi (97 km) north of the U.S.–Mexico border. Tucson is the 34th largest city and the 53rd largest metropolitan area in the United States (2014).

Major incorporated suburbs of Tucson include Oro Valley and Marana northwest of the city, Sahuarita south of the city, and South Tucson in an enclave south of downtown. Communities in the vicinity of Tucson (some within or overlapping the city limits) include Casas Adobes, Catalina Foothills, Flowing Wells, Midvale Park, Tanque Verde, Tortolita, and Vail. Towns outside the Tucson metro area include Benson to the southeast, Catalina and Oracle to the north, and Green Valley to the south.

Tucson was founded as a military fort by the Spanish when Hugo O'Conor authorized the construction of Presidio San Agustín del Tucsón in 1775. It was included in the state of Sonora after Mexico gained independence from the Spanish Empire in 1821. In 1853, the United States acquired a 29,670 square miles (76,840 km2) region of present-day southern Arizona and southwestern New Mexico from Mexico under the Gadsden Purchase. Tucson served as the capital of the Arizona Territory from 1867 to 1877. Tucson was Arizona's largest city by population during the territorial period and early statehood, until it was surpassed by Phoenix by 1920. Nevertheless, population growth remained strong during the late 20th century. In 2017, Tucson was the first American city to be designated a "City of Gastronomy" by UNESCO.

Nong'an County, which belongs to Changchun City, Jilin Province, is located in the hinterland of Songliao Plain, with 124 °31 degrees east longitude 125 °45 degrees east longitude and 43 °55 degrees north latitude 44 °55 'north latitude. Dehui City to the east, Changchun City to the south, Gongzhuling City and Changling County to the west, and Songyuan City to the north. The ancient city of Nong'an was founded in the country of Gufuyu (Fuyu), known as Huanglong House in ancient times, which is an important town in the north, with vast plains and developed industry and agriculture. The county covers an area of 5400 square kilometers and has jurisdiction over 4 streets and 22 townships, including 3 provincial industrial parks, 3 municipal industrial parks and 377 administrative villages, with a total population of 1.2 million (2013). Nong'an County is located in the ecological economy in the west of Jilin Province. Within the one-hour economic circle of Changchun metropolitan area, Nong'an County is an important fulcrum for the westward extension of Changjitu national strategy.
Airport In Nongan County - Changchun Longjia International Airport
Changchun Longjia International Airport (Changchun Longjia International Airport, IATA: CGQ, ICAO: ZYCC), located at the junction of Donghu Town and Longjia Town, Jiutai District, Changchun City, Jilin Province, China, about 32 kilometers southwest of Changchun city center and southeast About 76 kilometers away from the center of Jilin, it is a 4E-level international trunk airport, an international regional hub in Northeast Asia, and a freight distribution center for China and Europe   .
On May 29, 2003, Changchun Longjiahu Airport officially started construction; on July 15, 2005, Changchun Longjiahu Airport was renamed "Changchun Longjia International Airport"; on August 27, 2005, Changchun Longjia International Airport officially Open to aviation, Changchun Dafangshen Airport and Jilin Ertaizi Airport have been transferred to this location for overall civil aviation operations   .
As of February 2021, Changchun Longjia International Airport has 2 terminals with a total construction area of ​​204,000 square meters; the civil aviation station has 61 aircraft seats, including 32 near aircraft seats; the runway is 3,200 meters long and 45 meters wide ; It can meet the needs of annual passenger throughput of 16 million passengers   .
In 2020, the passenger throughput of Changchun Longjia International Airport was 9.360541 million passengers, a year-on-year decrease of 32.8%, ranking 29th in the country; the cargo and mail throughput was 83,672 tons, a year-on-year decrease of 5.9%, ranking 32nd in the country; the number of aircraft movements was 75,510 Flights, down 23.6% year-on-year, ranking 37th in the country   .
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