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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.

Huangdao District, also known as Qingdao West Coast New area, is not only a municipal district of Qingdao, but also the ninth national new area of the people's Republic of China. Huangdao District is a national land and sea development pilot area, an international high-end marine industry agglomeration area, a demonstration zone for international cooperation in marine economy, an international shipping hub and a blue economy pilot zone in Shandong Peninsula. Among them, 6 streets in the north and Wangtai (including Huangshan Economic Zone) and Lingshanwei subdistrict office (including Jimiya Port area) are the first batch of Qingdao Economic and technological Development Zone approved by the State Council. Qingdao Qianwan bonded Port area and Dongjiakou Port area are located in Huangdao District. In 2012, the original Huangdao District and Jiaonan City of Qingdao were abolished, and a new Huangdao District of Qingdao was established. The West Coast Economic New Zone of Qingdao was established in 2014, including the whole of Huangdao District.
Airport In Huangdao district - Qingdao Jiaodong International Airport
Qingdao Jiaodong International Airport (Qingdao Jiaodong International Airport, IATA: TAO, ICAO: ZSQD), located in Qiandiankou Village, Jiaodong Street, Jiaozhou City, Qingdao City, Shandong Province, China, 11 kilometers southwest of Jiaozhou city center and 39 kilometers southeast of Qingdao city center It is 28 kilometers away from Qingdao Liuting International Airport (disused) in the southeast and 6 kilometers away from Jiaozhou Airport of the Navy in the west (relocated). It is a 4F international airport, a regional hub airport, and a gateway airport for Japan and South Korea       .
On June 26, 2015, the foundation stone of Qingdao New Airport project started; on November 21, 2018, Qingdao New Airport was named "Qingdao Jiaodong International Airport"   ; On January 27, 2021, the test flight of Qingdao Jiaodong International Airport was successful [twenty two]  ; On August 12, 2021, Qingdao Jiaodong International Airport will officially open to traffic   .
As of August 2021, the terminal area of ​​Qingdao Jiaodong International Airport is 540,000 square meters, with 97 boarding bridges; there are 173 aircraft seats on the civil aviation platform, of which 5 are F-class aircraft seats; The distance from the runway is 3,600 meters long, and the width is 45 meters and 60 meters respectively; it can meet the use requirements of 35 million passenger throughput, 500,000 tons of cargo and mail throughput, and 298,000 aircraft movements in 2025     .
In September 2021, Qingdao Jiaodong International Airport completed a total passenger throughput of 1,137,401 passengers, ranking fourth in East China; cargo throughput of 20,404 tons, ranking fifth in East China; aircraft movements of 12,094, ranking first in East China 4   .
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