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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.

Dong'an County, belonging to Yongzhou City, Hunan Province, is located in the southwest of Hunan Province, the upper reaches of Xiangjiang River; the terrain is high in the northwest and low in the southeast; it is a mid-subtropical monsoon humid climate zone with four distinct seasons; the total area of the county is 2219 square kilometers. As of 2018, Dongan County has jurisdiction over 13 towns, 2 townships and 2 forest farms, with a registered population of 646500 and a resident population of 578500. Dongan County was located in the south of Chu during the Spring and Autumn and warring States period, Yingyang County was established in the Western Jin Dynasty (290 years), and Dongan County was first established in the Northern Song Dynasty (984). He gave birth to historical celebrities such as Deng Sanfeng, Shangshu of the Libu Department of the Southern Song Dynasty, Xi Baotian, Prince Shaobao of the Qing Dynasty, Tang Renlian, the governor of Guangdong in the Qing Dynasty, Binbucheng, the "locomotive" of the modern machinery industry, and Tang Shengzhi, a famous patriotic general. Dong'an is also the first batch of named "hometown of Wushu & amp" in the country.
Airport In Dongan - Yongzhou Lingling Airport
Yongzhou Lingling Airport (Yongzhou Lingling Airport, IATA: LLF, ICAO: ZGLG), referred to as "Yongzhou Airport", is located on Yingbin Road, Lanjiaoshan Street, Lengshuitan District, Yongzhou City, Hunan Province, China, 9.5 kilometers north of the urban area of ​​Lengshuitan District, 12.5 kilometers away from the urban area of ​​Lingling District in the south, it is a 4C-level naval military-civilian joint feeder airport and a first-level permanent military airport of the Chinese People's Liberation Army Naval Air Force   .
In October 1993, the Central Military Commission agreed that Lingling Caijiabu Airport should be used for both military and civilian use, and the civilian part was named "Yongzhou Lingling Airport"; on April 30, 2001, the civilian part of Yongzhou Lingling Airport was officially opened to navigation   ; On April 18, 2019, the runway of Yongzhou Lingling Airport was suspended for renovation   ; On January 31, 2021, Yongzhou Lingling Airport will resume flights   .
As of January 2021, the terminal area of ​​Yongzhou Lingling Airport is 4,705.8 square meters, and there are 6 C-class seats on the civil aviation apron; the runway is 2,600 meters long and 50 meters wide; it can guarantee an annual passenger throughput of 1.15 million passengers, aircraft The demand for take-off and landing of 30,000 sorties; the largest usable models are Boeing B737-800, Airbus A320-200, Airbus A321-200   .
In 2021, Yongzhou Lingling Airport will handle a total of 165,801 passengers, ranking 192nd in the country; cargo and mail throughput will be 3.2 tons, ranking 222nd in the country; aircraft take-offs and landings will be 1998, ranking 209th in the country   .
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