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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.

Changsha County, which belongs to Changsha City, Hunan Province, is also known as "Xingsha" and has been known as "the first good in Sanxiang" since ancient times. Changsha County is located in the middle of Changsha City, eastern Hunan Province, located in longitude 112o 560015 "~ 113o 3600" east longitude, latitude 27 °540055" ~ 28 °380055 "north, Liuyang City, west and south of Changsha City, north of Yueyang City Pingjiang County, Miluo City; Liuyang River and Ladao River run through the territory; the total area is 1756 square kilometers, under the jurisdiction of 13 towns and 5 streets, with a resident population of 946000 (2016). Changsha County is located in the core of the comprehensive reform pilot area of "two-oriented society" in Changsha, Zhuzhou and Xiangtan, and it is one of the 18 typical areas of reform and opening up in the country. In 2016, the county achieved a GDP of 128.03 billion yuan.
Airport In Changsha County - Changsha Huanghua International Airport
Changsha Huanghua International Airport (Changsha Huanghua International Airport, IATA: CSX, ICAO: ZGHA, CAAC: HHA), located at No. 1 Airport City, Huanghua Town, Changsha County, Changsha City, Hunan Province, China, 23.5 kilometers west of Changsha city center, 4E It is a first-class international airport, one of the twelve major trunk line airports in China, an airport with international scheduled flights, a first-class air port open to the outside world, one of the top ten regional international aviation hubs in China, the gateway airport of China (Hunan) Free Trade Pilot Zone, Hunan Airlines Main operating base        .
On June 25, 1986, the construction of Changsha Huanghua Airport started   ; On August 29, 1989, Changsha Huanghua Airport was officially opened, and Changsha Datuopu Airport was converted into a military airport; in 1993, Changsha Huanghua Airport was officially renamed Changsha Huanghua International Airport; on July 19, 2011, Changsha Huanghua International Airport T2 Terminal opened   ; On January 1, 2016, Changsha Huanghua International Airport implemented a 72-hour visa-free transit policy for foreigners   ; On March 30, 2017, the second runway of Changsha Huanghua International Airport was opened; on May 16, 2018, the T1 terminal of Changsha Huanghua International Airport was reopened   .
As of July 2021, Changsha Huanghua International Airport has 2 terminals, of which the T1 terminal covers an area of ​​53,000 square meters, the T2 terminal covers an area of ​​213,000 square meters, and the total area of ​​4 air cargo terminals is 82,471 square meters; There are 87 aircraft positions on the civil aviation station, 32 of which are close to the aircraft; there are 2 short-distance runways, the first runway is 3,200 meters long and 45 meters wide, and the second runway is 3,800 meters long and 60 meters wide; it can meet the annual passenger throughput 35 million passengers, 440,000 tons of cargo and mail throughput, and 244,000 aircraft takeoffs and landings           .
In 2021, Changsha Huanghua International Airport will handle a total of 19,983,064 passengers, a year-on-year increase of 3.9%, ranking 12th in the country; cargo and mail throughput will be 209,074.5 tons, a year-on-year increase of 8.9%, ranking 16th in the country; aircraft movements will reach 162,977 Flights, a year-on-year increase of 4.3%, ranking 15th in the country   .
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