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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.

Yinan County, which belongs to Linyi City, Shandong Province, is located in the middle of Shandong Province, with Ju County in the east, Mengyin in the west, urban area in the south and Yishui in the north. It is between latitude 35o 180026 "- 35o 460015" north and longitude 118o 63031 "east, with a total area of 1706 square kilometers. Yinan, the ancient capital of Langyangyang, is the birthplace and ancestral home of Zhuge Liang and Yan Zhenqing. There are many cultural relics and cultural landscapes in the territory, and there are nearly 100 monuments in the Han Dynasty, known as "Qilu Dunhuang". In history: "Yangdu, Linyi, a large number of heroes, the victory of smoke and water, anecdotes in the south of the Yangtze River." During the Revolutionary War, the first provincial democratic regime led by Communist Party of China was born in Yinan. Chen Yi, Xu Qian, Luo Ronghuan and Su Yu all fought and worked in Yinan. twenty
Airport In YINAN - Linyi Qiyang Airport
Linyi Qiyang Airport (LINYI QIYANG AIRPORT; IATA: LYI, ICAO: ZSLY), located in Hedong District, Linyi City, Shandong Province, China, about 7.8 kilometers away from Linyi City, is a 4D-level civil airport and the first civil aviation in Shandong Province Airport   .
The airport was first built in 1934; it underwent two relocations in 1958 and 1998   ; On December 26, 1998, the flight resumed and was named Linyi Shubuling Airport   ;Renamed to Linyi Qiyang Airport on December 30, 2019   .
According to information on the airport's official website in June 2019, Linyi Qiyang Airport has two terminals, T1 (domestic in China) and T2 (international, Hong Kong, Macao and Taiwan) with a total area of ​​23,000 square meters; there is a runway with a length of 3,200 square meters. meters, with an apron of 160,000 square meters and 35 seats, which can guarantee an annual passenger throughput of 2.5 million passengers and a peak hour passenger throughput of 1,250 passengers     . A total of 37 domestic navigation cities in China have been opened   .
In 2020, due to the decline in passenger flow due to the impact of the global epidemic, the passenger throughput of Linyi Qiyang Airport was 1.8773 million, a year-on-year decrease of 27.3%; the cargo and mail throughput was 10,500 tons, a year-on-year increase of 2.4%; Increased by 37.0%; ranked 57th, 58th, and 71st in China respectively (ranked 61st, 58th, and 86th in China in 2019)   .
In 2021, the passenger throughput will reach 2,580,800 passengers, a year-on-year increase of 28.06%, and its ranking among 238 airports in the country will rise from 66th in 2018 to 61st in 2019, making it the largest and busiest airport in the southern part of Shandong Province . [twenty three] 
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