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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.

Yanji City belongs to Yanbian Korean Autonomous Prefecture of Jilin Province. Yanji City is the center of politics, economy, culture and foreign exchanges of the whole prefecture. It is located in the east of Jilin Province, the middle of Yanbian Prefecture, the northern foot of Changbai Mountain, the hinterland of Northeast Asia economic circle, and a fulcrum of the Tumen River "Golden Triangle" drawn up by the United Nations. It is only 60 kilometers away from the Sino-Russian border, 80 kilometers away from the Sea of Japan, and more than 10 kilometers away from the border between China and North Korea in the south. Yanji is a central city in the east of Jilin Province, an excellent tourist city in China and one of the top 100 counties in China. The comprehensive economic strength of Yanji county has always been in the first place in Jilin Province. The scenic spots in Yanji are: Maoershan National Forest Park, Chengzishan Mountain City site, Mengdu Beauty Folk Tourism Resort, Chunxing Village, Korean ancient village and so on. Yanji is listed as the first batch of national new urbanization.
Airport In Yanji - Yanji Chaoyangchuan International Airport
Yanji Chaoyangchuan International Airport (Yanji Chaoyangchuan International Airport, IATA: YNJ, ICAO: ZYYJ), located in Chaoyangchuan Town, Yanji City, Yanbian Korean Autonomous Prefecture, Jilin Province, is a 4C-level military-civilian airport.  
Yanji Chaoyangchuan International Airport was built in 1952. In 1985, with the approval of the State Council and the Central Military Commission, Yanji Chaoyangchuan Airport was converted into a military-civilian airport. On August 29, 1985, Yanji Chaoyangchuan Airport opened civil aviation routes. In December 1993, Yanji Chaoyangchuan Airport completed the flight area expansion project. In April 1997, the new terminal building project was completed. On June 9, 2017, it was approved by China Civil Approved by the Aviation Administration, the name was changed to Yanji Chaoyangchuan International Airport.   
As of April 2022, Yanji Chaoyangchuan International Airport has a terminal building with an area of ​​21,720 square meters, 4 covered bridges, 11 parking stands, and a 2,600-meter-long runway. It has 16 domestic and foreign waypoints, including 15 domestic waypoints and 1 foreign waypoint.   
In 2021, the passenger throughput of Yanji Chaoyangchuan International Airport will be 580,500, a year-on-year increase of 1.4%, ranking 123rd in the country; the cargo and mail throughput will be 3,691.1 tons, a year-on-year decrease of 1.3%, ranking 82nd in the country, with 6,087 take-offs and landings, A year-on-year increase of 6.0%.  
At 16:05 on October 30, 2022, the Chengdu Tianfu-Yantai-Yanji round-trip route was officially opened.  
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