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Dallas (/ˈdæləs/) is the third largest city in Texas and the largest city in the Dallas–Fort Worth metroplex, the fourth-largest metropolitan area in the United States at 7.5 million people. It is the largest city in and seat of Dallas County with portions extending into Collin, Denton, Kaufman and Rockwall counties. With a 2020 census population of 1,304,379, it is the ninth most-populous city in the U.S. and the third-largest in Texas after Houston and San Antonio. Located in the North Texas region, the city of Dallas is the main core of the largest metropolitan area in the southern United States and the largest inland metropolitan area in the U.S. that lacks any navigable link to the sea.[a]

The cities of Dallas and nearby Fort Worth were initially developed due to the construction of major railroad lines through the area allowing access to cotton, cattle and later oil in North and East Texas. The construction of the Interstate Highway System reinforced Dallas's prominence as a transportation hub, with four major interstate highways converging in the city and a fifth interstate loop around it. Dallas then developed as a strong industrial and financial center and a major inland port, due to the convergence of major railroad lines, interstate highways and the construction of Dallas/Fort Worth International Airport, one of the largest and busiest airports in the world. In addition, Dallas has DART (Dallas Area Rapid Transit) with different colored train lines that transport throughout the Metroplex.

Dominant sectors of its diverse economy include defense, financial services, information technology, telecommunications, and transportation. The Dallas–Fort Worth metroplex hosts 23 Fortune 500 companies, the second most in Texas and fourth most in the United States, and 11 of those companies are located within Dallas city limits. Over 41 colleges and universities are located within its metropolitan area, which is the most of any metropolitan area in Texas. The city has a population from a myriad of ethnic and religious backgrounds and one of the largest LGBT communities in the U.S. WalletHub named Dallas the fifth most diverse city in the United States in 2018.

Longan County, which belongs to Nanning City, Guangxi Zhuang Autonomous region, is located in the southwest of Guangxi Zhuang Autonomous region and on both sides of the lower reaches of the Youjiang River. it is located at 107 °21 °E longitude 108 °6 °E, 22 °51 °N 23 °21 °N, Wuming County to the east and northeast, West Liantian County and Daxin County, which is connected to pingguo County in the northwest and bordered by Xixiangtang District of Nanning City and Jiangzhou District and Fusui County of Chongzuo City in the south. The maximum horizontal distance between east and west is 77 km and the maximum vertical distance between north and south is 56 km. With a total area of 2277 square kilometers, Longan County belongs to the humid monsoon climate of the south subtropics, hot and rainy, short in winter and long in summer. As of 2018, Longan County has jurisdiction over 6 towns and 4 townships, and the county people's government is stationed in Chengxiang Town. Longan County is an important transportation hub of railways, highways and waterways in Southwest China. As of 2018, Longan County
Airport In Long'an County - Nanning Wuxu International Airport
Nanning Wuxu International Airport (Nanning Wuxu International Airport, IATA: NNG; ICAO: ZGNN), located in Wuxu Town, Jiangnan District, Nanning City, Guangxi Zhuang Autonomous Region, China, 27.8 kilometers away from the city center   , is a 4E-level military-civilian international airport, the largest aviation hub in Guangxi Zhuang Autonomous Region, one of China's tens of millions of airports, an international gateway hub airport facing ASEAN, a first-class air port open to the outside world, and an alternate airport for international flights.  
Nanning Wuxu International Airport was officially completed and opened to navigation in November 1962   , was relocated from Nanning Airport in 1958; the first-phase expansion project was completed in 1990; the second-phase expansion project was completed on September 25, 2014   ; In 2019, the renovation and expansion of the T1 terminal area and the expansion of the runway in the T2 terminal area will begin     ; On March 19, 2020, it was approved to build the second runway and T3 terminal   .
As of January 2019, Nanning Wuxu International Airport has two terminal buildings, namely T1 (under renovation) and T2 (China's domestic and international Hong Kong, Macao and Taiwan), with a total area of ​​214,800 square meters   There is a runway with a length of 3,200 meters and 64 parking spaces (excluding T1); it can meet the annual passenger throughput of 16 million passengers, cargo and mail throughput of 164,000 tons, and aircraft take-off and landing of 137,600 sorties   . As of March 2019, a total of 121 domestic and international routes have been opened, covering 93 cities   .
In 2020, due to the impact of the global epidemic, the passenger throughput of Nanning Wuxu International Airport was 10.5841 million passengers, a year-on-year decrease of 32.9%; the cargo and mail throughput was 107,100 tons, a year-on-year decrease of 12.4%; Decreased by 23.1%; ranking 27th, 29th and 30th in China respectively   ;
On July 11, 2021, the "air-to-air transfer" business of international orders will be launched   ; On July 9, the National Civil Aviation Administration issued the "Letter on Feasibility Study Report of Nanning Airport Reconstruction and Expansion Project and Other Relevant Opinions". Nanning Airport will be rebuilt and expanded, and a new second runway will be built.  
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