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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.

Jinan, also known as Quancheng, is the capital of Shandong Province, the vice-provincial city, the core city of Jinan metropolitan area, and the central city in the southern wing of the Bohai Sea area approved by the State Council. By 2018, the city had jurisdiction over 10 districts and 2 counties, with a total area of 10244 square kilometers, a built-up area of 561square kilometers, a resident population of 7.4604 million, an urban population of 5.3789 million, and a urbanization rate of 72.1 per cent. Jinan is located in East China, the central and western part of Shandong Province and the eastern edge of the North China Plain. Jinan is the army headquarters in the northern theater of the Chinese people's Liberation Army, the core city of the Shandong Peninsula urban agglomeration, the capital economic circle in the north, the Yangtze River Delta economic circle in the south, and the Shandong Peninsula in the east and west.
Airport In Jinan - Jinan Yaoqiang International Airport
Jinan Yaoqiang International Airport (Jinan Yaoqiang International Airport, IATA: TNA, ICAO: ZSJN), located at the junction of Licheng District and Zhangqiu District, Jinan City, Shandong Province, China, 30 kilometers away from the city center, is a 4E-class civil international airport. One of the important entry gateways and arterial airports.  
Jinan Yaoqiang International Airport was completed and opened to navigation on July 26, 1992. The expansion project of the flight area was completed in October 2000; the expansion project of the terminal area was completed in March 2005; and the south concourse project of the terminal building was started in 2010.  
According to information on the airport's official website in September 2017, Jinan Yaoqiang International Airport covers an area of ​​7,200 acres, with a total terminal building area of ​​114,000 square meters, of which the south corridor covers an area of ​​30,000 square meters, which can guarantee an annual passenger throughput of 12 million , 4,500 passengers at peak hours, and 100,000 aircraft takeoffs and landings; the apron is 440,000 square meters in total, with 24 boarding bridges.   As of the end of 2016, the airport has more than 140 air routes.  
In 2018, the passenger throughput of Jinan Yaoqiang International Airport reached 16.612 million, a year-on-year increase of 16%   . On the morning of August 27, 2022, the Jinan Yaoqiang Airport Phase II Reconstruction and Expansion Project Construction Promotion Meeting was held at Yaoqiang International Airport.  
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