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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.

Daan is a county-level city in Baicheng City, Jilin Province, which is located in the northwest of Jilin Province and in the hinterland of Songnen Plain. The total area is 4879 square kilometers. As of 2014, Daan has jurisdiction over 5 streets, 10 towns and 8 townships. There are 430000 people in Daan. There are 104 ancient cultural relics in Daan City, such as the Neolithic site, the Han Shu site of the Yin and Shang dynasties, the Banshan site of the Liao and Jin dynasties, and the Princess Mausoleum of the Qing Dynasty. The famous scenic spot in Daan City is Nenjiang Bay National Wetland Park. In 2019, it was listed as the second batch of national agricultural product quality and safety counties. ...
Airport In Daan City - Baicheng Chang'an Airport
Baicheng Chang'an Airport (BaiCheng ChangAn Airport, IATA: DBC, ICAO: ZYBA), located in Diaojiatun Airport Road, Taohe Town, Taobei District, Baicheng City, Jilin Province, China, 18.5 kilometers away from the center of Baicheng City in the northwest, is a 4C-level military-civilian regional airport   .
On October 26, 2012, the foundation stone of Baicheng Chang'an Airport was laid; on May 25, 2016, the test flight of Baicheng Chang'an Airport was successful; on March 31, 2017, Baicheng Chang'an Airport was officially open to navigation, and it was implemented for military and civilian use   .
As of February 2021, the terminal area of ​​Baicheng Chang'an Airport is 4,500 square meters, and the parking lot area is 4,000 square meters; there are 1 Class B seat and 3 Class C seats on the civil aviation station; the runway is 2,500 meters long and 45 meters wide ; It can meet the needs of annual passenger throughput of 200,000 passengers, cargo and mail throughput of 700 tons, and annual aircraft take-off and landing of 2,459 sorties      .
In 2020, Baicheng Chang'an Airport completed a total of 73,838 passenger throughput, a year-on-year increase of 13.3%, ranking 211th in the country; cargo and mail throughput was 1.2 tons, a year-on-year increase of 17.4%, ranking 221st in the country; aircraft took off and landed 1,594 sorties, Year-on-year growth of 120.8%, ranking 209th in the country   .
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