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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.

Dandong, a prefecture-level city in Liaoning Province, is located in the southeast of Liaoning Province, facing Xinyi City of the Democratic people's Republic of Korea in the east, the Yellow Sea in the south, Anshan in the west, Dalian in the southwest and Benxi in the north. The geographical coordinates are 123 °22'E to 125 °42'E and 39 °43'N to 41 °09'N. The maximum horizontal distance from east to west is 196km, the maximum vertical distance from north to south is 160km, the coastline is 126km long, with a total area of 15222 square kilometers and a population of 2.34 million. It has jurisdiction over 3 municipal districts, 1 autonomous county and 2 county-level cities. Dandong is the starting point of the northern end of China's coastline and is located in the heart of Northeast Asia. it is an important intersection of the Northeast Asian economic circle and the economic circle around the Bohai Sea and the Yellow Sea.
Airport In Dandong - Dandong Langtou Airport
Dandong Langtou Airport (Dandong Langtou Airport, IATA: DDG, ICAO: ZYDD), located on the east side of National Highway 201, Langtou Town, Zhenxing District, Dandong City, Liaoning Province, China, 6 kilometers east of Dandong city center, is a 4C-level military-civilian joint feeder airport   .
On December 21, 1985, Dandong Langtou Airport officially opened civil aviation services, and Donggou Qianyang Airport civil aviation was closed; on April 9, 2007, the air port of Dandong Langtou Airport was temporarily opened to the public; on April 17, 2014, Dandong Langtou Airport Singapore Airlines Station opening   .
According to the official website of Liaoning Provincial Airport Management Group Co., Ltd. in April 2020, the terminal area of ​​Dandong Langtou Airport is 20,780 square meters, with 2 boarding bridges; the civil aviation station area is 39,600 square meters, with 6 C-class aircraft seats ;The runway is 2,600 meters long and 45 meters wide; it can meet the needs of annual passenger throughput of 2 million passengers and cargo and mail throughput of 4,200 tons   .
In 2019, Dandong Langtou Airport completed a total of 259,048 passenger throughput, a year-on-year increase of 211.2%, ranking 179th in the country; cargo and mail throughput was 652.1 tons, a year-on-year increase of 50.9%, ranking 141st in the country; 2053 aircraft movements, Year-on-year growth of 187.1%, ranking 209th in the country   .
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