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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.

Datong District is a municipal district of Daqing City, Heilongjiang Province, which is located in the southwest of Daqing City. Datong is located in the west of Songnen Plain and in the south of Daqing City. It is the largest of the five administrative regions. With an area of 2235 square kilometers and a population of 250000 (2004), there are 18 ethnic groups, including Han, Manchu and Mongolian. It has jurisdiction over 8 townships, 58 administrative villages, 315 natural villages, 6 subdistrict offices and 18 communities. In March 2019, it was announced by the Ministry of Water Resources as the first batch of counties (districts) for the construction of a water-saving society.
Airport In Datong Qu - Daqing Saertu Airport
Daqing Sartu Airport (Daqing Sartu Airport, IATA: DQA, ICAO: ZYDQ), located at the junction of Sartu District, Daqing City, Heilongjiang Province, China and Anda City, Suihua City, 17.5 kilometers away from the eastern urban area of ​​Daqing City, and west of Daqing City The urban area is 22.5 kilometers away, and it is a 4C-level domestic feeder airport in China   .
In October 2008, the construction of Daqing Sartu Airport started; on September 1, 2009, Daqing Sartu Airport was officially opened to navigation; on June 15, 2019, the construction of the international terminal of Daqing Sartu Airport started   .
According to the official website of the airport in February 2021, the terminal building of Daqing Sartu Airport covers an area of ​​13,987 square meters, with 4 boarding bridges; the civil aviation station has 8 seats, including 1 class B seat and 6 C seats. Class aircraft stand, 1 dedicated deicing stand; the runway is 2,600 meters long and 45 meters wide; it can meet the needs of an annual passenger throughput of 1.47 million and a peak hour of 933 passengers   .
In 2019, Daqing Sartu completed a total of 858,021 passenger throughput, a year-on-year increase of 3.2%, ranking 117th in the country; cargo and mail throughput was 1,324.6 tons, a year-on-year decrease of 6.7%, ranking 111th in the country; aircraft movements took off and landed 6,697 , ranked 148th nationally   .
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