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Baltimore (/ˈbɔːltɪmɔːr/ BAWL-tim-or, locally: /bɔːldəˈmɔːr/ bawl-da-MOR or /ˈbɔːlmər/ BAWL-mər) is the most populous city in the U.S. state of Maryland, fourth most populous city in the Mid-Atlantic, and the 30th most populous city in the United States with a population of 585,708 in 2020. Baltimore was designated an independent city by the Constitution of Maryland[a] in 1851, and today is the most populous independent city in the United States. As of 2021, the population of the Baltimore metropolitan area was estimated to be 2,838,327, making it the 20th largest metropolitan area in the country. Baltimore is located about 40 miles (64 km) north northeast of Washington, D.C., making it a principal city in the Washington–Baltimore combined statistical area (CSA), the third-largest CSA in the nation, with a 2021 estimated population of 9,946,526.

Prior to European colonization, the Baltimore region was used as hunting grounds by the Susquehannock Native Americans, who were primarily settled further northwest than where the city was later built. Colonists from the Province of Maryland established the Port of Baltimore in 1706 to support the tobacco trade with Europe, and established the Town of Baltimore in 1729. The first printing press and newspapers were introduced to Baltimore by Nicholas Hasselbach and William Goddard respectively, in the mid-18th century.

The Battle of Baltimore was a pivotal engagement during the War of 1812, culminating in the failed British bombardment of Fort McHenry, during which Francis Scott Key wrote a poem that would become "The Star-Spangled Banner", which was eventually designated as the American national anthem in 1931. During the Pratt Street Riot of 1861, the city was the site of some of the earliest violence associated with the American Civil War.

Nanjing, referred to as "Ning", known as Jinling and Jiankang in ancient times, is the capital of Jiangsu Province, the vice-provincial city and the core city of Nanjing metropolitan area. it is an important central city in eastern China, an important scientific research and education base and a comprehensive transportation hub in China as approved by the State Council. By 2018, the city had jurisdiction over 11 districts, with a total area of 6587 square kilometers, a built-up area of 971.62 square kilometers, a resident population of 8.4362 million, an urban population of 6.9599 million, and an urbanization rate of 82.5%. It is a mega-city in the Yangtze River Delta and East China. Nanjing is located in eastern China, the lower reaches of the Yangtze River and near the Yangtze River. it is the headquarters of the theater in eastern China, the national logistics hub, the international shipping and logistics center of the Yangtze River, and an important national gateway city in the Yangtze River Delta that promotes the development of the central and western regions. it's also east.
Airport In Nanjing - Nanjing Lukou International Airport
Nanjing Lukou International Airport (Nanjing Lukou International Airport, IATA: NKG, ICAO: ZSNJ), located in Lukou Street, Jiangning District, Nanjing City, Jiangsu Province, is the gateway to Jiangsu Province and Nanjing City, and is the main national trunk airport and a first-class air port , the main cargo airport in East China   , with Shanghai Hongqiao Airport and Pudong Airport as alternate airports   , is a national large-scale hub airport, China Air Cargo Center and express mail distribution center   , the national regional transportation hub.   
Nanjing Lukou International Airport started construction in February 1995 and officially opened to air on July 1, 1997; in 2005, it was awarded the title of "International Sanitary Airport" by the World Health Organization; in 2009, the passenger throughput exceeded 10 million passengers, entering China's tens of millions In July 2014, the second phase of the project was completed and opened; in June 2015, the route from Nanjing to Los Angeles was opened, and Nanjing became the fifth city in China to open regular passenger routes to Europe, Australia and the United States.     
As of August 2020, Lukou Airport is a 4F-level airport. Nanjing Lukou International Airport has two 3,600-meter runways, two terminal buildings, two cargo terminals and a transportation center. The terminal building has a construction area of ​​425,000 square meters , the apron area is nearly 1.1 million square meters. With 135 domestic routes and 23 international routes, connecting to 115 destinations at home and abroad, it has preliminarily established a route network that radiates to Asia, connects Europe and the United States, and reaches Australia.    
In 2017, the passenger throughput of Nanjing Lukou International Airport was 25.822 million, a year-on-year increase of 15.5%, ranking 11th in the country; the cargo and mail throughput was 374,000 tons, a year-on-year increase of 9.6%, ranking 10th in the country; takeoffs and landings were 209,000 , of which 208,000 took off and landed, a year-on-year increase of 11.4%.  
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