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Philadelphia, often called Philly, is the largest city in the Commonwealth of Pennsylvania, the sixth-largest city in the U.S., and the second-largest city in both the Northeast megalopolis and Mid-Atlantic regions after New York City. Since 1854, the city has been coextensive with Philadelphia County, the most populous county in Pennsylvania and urban core of the Delaware Valley, the nation's seventh-largest and one of world's largest metropolitan regions with 6.245 million residents in 2020. The city's population at the 2020 census was 1,603,797, and over 56 million people live within 250 mi (400 km) of Philadelphia.

Philadelphia was founded in 1682 by William Penn, an English Quaker. The city served as capital of the Pennsylvania Colony during the British colonial era and went on to play a historic and vital role as the central meeting place for the nation's founding fathers whose plans and actions in Philadelphia ultimately inspired the American Revolution and the nation's independence. Philadelphia hosted the First Continental Congress in 1774 following the Boston Tea Party, preserved the Liberty Bell, and hosted the Second Continental Congress during which the founders signed the Declaration of Independence, which historian Joseph Ellis has described as "the most potent and consequential words in American history". Once the Revolutionary War commenced, both the Battle of Germantown and the Siege of Fort Mifflin were fought within Philadelphia's city limits. The U.S. Constitution was later ratified in Philadelphia at the Philadelphia Convention of 1787. Philadelphia remained the nation's largest city until 1790, when it was surpassed by New York City, and served as the nation's first capital from May 10, 1775, until December 12, 1776, and on four subsequent occasions during and following the American Revolution, including from 1790 to 1800 while the new national capital of Washington, D.C., was under construction.

With 18 four-year universities and colleges, Philadelphia is one of the nation's leading centers for higher education and academic research. As of 2021[update], the Philadelphia metropolitan area was the state's largest and nation's ninth-largest metropolitan economy with a gross metropolitan product (GMP) of US$479 billion. The city is home to five Fortune 500 corporate headquarters as of 2022. The Philadelphia skyline, which includes several globally renowned commercial skyscrapers, is expanding, primarily with new residential high-rise condominiums. Philadelphia and the Delaware Valley are a biotechnology and venture capital hub; and the Philadelphia Stock Exchange, owned by NASDAQ, is the nation's oldest stock exchange and a global leader in options trading. 30th Street Station, the city's primary rail station, is the third-busiest Amtrak hub in the nation, and the city's multimodal transport and logistics infrastructure, including Philadelphia International Airport, the PhilaPort seaport, freight rail infrastructure, roadway traffic capacity, and warehouse storage space, are all expanding.

Gulou District is the central city of Nanjing, an important national center of scientific and technological innovation and shipping logistics service, the international business, financial and economic center of the eastern part of the country, and the gathering area of high-end industries and headquarters enterprises in East China. It is not only the center of Nanjing's economy, culture and education, but also the seat of Jiangsu provincial party committee, provincial government organs and the political, cultural and administrative center of Jiangsu Province. The construction of Gulou District began in the Republic of China in 22 years (1933), which originated from the sixth and seventh districts in the period of the Republic of China. Gulou District has a long history. There were many primitive villages five or six thousand years ago, bordering the Yangtze River, surrounded by mountains, dependent on lakes and rivers, integrated with mountains, rivers, cities, forests and rivers.
Airport In Gulou District - 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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