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Miami (/maɪˈæmi/ my-AM-ee), officially the City of Miami, known as "the 305", "The Magic City", and "Gateway to the Americas", is a major city, a coastal metropolis and the county seat of Miami-Dade County in South Florida, United States. With a population of 442,241 at the 2020 census, it is the second-most populous city in Florida and the eleventh-most populous city in the Southeastern United States. The Miami metropolitan area is the ninth largest in the U.S. with a population of 6.138 million in 2020. The city has the third-largest skyline in the U.S. with over 300 high-rises, 58 of which exceed 491 ft (150 m).

Miami is a major center and leader in finance, commerce, culture, arts, and international trade. Miami's metropolitan area is by far the largest urban economy in Florida and the 12th largest in the U.S., with a GDP of $344.9 billion as of 2017. According to a 2018 UBS study of 77 world cities, Miami is the second richest city in the U.S. and third richest globally in purchasing power. Miami is a majority-minority city with a Hispanic population of 310,472, or 70.2 percent of the city's population, as of 2020.

Downtown Miami has one of the largest concentrations of international banks in the U.S. and is home to many large national and international companies. The Health District is home to several major University of Miami-affiliated hospital and health facilities, including Jackson Memorial Hospital, the nation's largest hospital with 1,547 beds, and the Leonard M. Miller School of Medicine, the University of Miami's academic medical center and teaching hospital, and others engaged in health-related care and research. PortMiami, the city's seaport, is the busiest cruise port in the world in both passenger traffic and cruise lines. Miami is the second largest tourism hub for international visitors, after New York City. Miami has sometimes been called the Gateway to Latin America because of the magnitude of its commercial and cultural ties to the region.

Dongchang District, which belongs to Tonghua City, Jilin Province, is located in the urban center of Tonghua City, where the CPC Tonghua Municipal Committee and the people's Government of Tonghua City are located. It is located in the southeast of Jilin Province, with geographical coordinates between 125 °50 °E longitude 126 °07 °E and 41 °32 °N latitude 41 °49'. It is bordered by Erdaojiang District in the northeast, Ji'an City in the south, and Tonghua County in the west, northwest and southeast. In 2014, it covers an area of 382.6 square kilometers; it has jurisdiction over two townships, one town and seven streets; the total population is 315751 (2011); as of 2014, the GDP of Dongchang District was 14.5 billion yuan, an increase of 6.6 percent over 2013. Dongchang District has convenient transportation, with 303 National Highway, 201 National Highway and 202 National Highway as the main highway connecting the three northeastern provinces and entering the customs and going to the sea.
Airport In Dongchang District - Tonghua Sanyuanpu Airport
Tonghua Sanyuanpu Airport (Tonghua Sanyuanpu Airport, IATA: TNH, ICAO: ZYTN), located in Airport Road, Sanyuanpu Korean Town, Liuhe County, Tonghua City, Jilin Province, China, 41 kilometers southeast from the center of Tonghua, north from the county seat of Liuhe County 25.5 kilometers, a 4C-level military-civilian joint feeder airport (military and civil aviation fly in different fields)   .
On June 28, 2011, the construction of Tonghua Sanyuanpu Airport officially started; on December 4, 2013, the test flight of Tonghua Sanyuanpu Airport was successful; on June 18, 2014, Tonghua Sanyuanpu Airport officially opened for civil aviation business   .
According to the official website of the airport in April 2020, the terminal area of ​​Tonghua Sanyuanpu Airport is 3,034 square meters, and there are 4 seats on the civil aviation platform, including 3 class C seats and 1 class B seat; the runway is 2,300 meters long , 45 meters wide; can meet the annual passenger throughput of 194,000 person-times, cargo and mail throughput of 970 tons, and aircraft take-off and landing of 2,338 sorties.   .
In 2021, Tonghua Sanyuanpu Airport will handle a total of 127,603 passengers, a year-on-year increase of 29.2%, ranking 207th in the country; aircraft takeoffs and landings will reach 1,606, a year-on-year increase of 21.3%, ranking 221st in the country [twenty two]  .
From May 4, 2022, Tonghua Sanyuanpu Airport will be temporarily closed, and the specific resumption date will be adjusted in real time according to the construction progress [twenty one]  ; On July 1, the runway of Tonghua Airport has been closed for maintenance and reopened for use. [twenty four] 
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