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San Francisco (/ˌsæn frənˈsɪskoʊ/; Spanish for "Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California in the United States. The city proper is the fourth most populous in California and 17th most populous in the United States, with 815,201 residents as of 2021. It covers a land area of 46.9 square miles (121 square kilometers), at the end of the San Francisco Peninsula, making it the second most densely populated large U.S. city after New York City, and the fifth most densely populated U.S. county, behind only four of the five New York City boroughs. Among the 91 U.S. cities proper with over 250,000 residents, San Francisco was ranked first by per capita income (at $160,749) and sixth by aggregate income as of 2021. Colloquial nicknames for San Francisco include SF, San Fran, The City, Frisco, and Baghdad by the Bay.

San Francisco and the surrounding San Francisco Bay Area are a global center of economic activity and the arts and sciences, spurred by leading universities, high-tech, healthcare, FIRE, and professional services sectors. As of 2020, the metropolitan area, with 6.7 million residents, ranked 5th by GDP ($874 billion) and 2nd by GDP per capita ($131,082) across the OECD countries, ahead of global cities like Paris, London, and Singapore. San Francisco anchors the 13th most populous metropolitan statistical area in the United States with 4.6 million residents, and the fourth-largest by aggregate income and economic output, with a GDP of $669 billion in 2021. The wider San Jose–San Francisco–Oakland, CA Combined Statistical Area is the fifth most populous, with 9.5 million residents, and the third-largest by economic output, with a GDP of $1.25 trillion in 2021. In the same year, San Francisco proper had a GDP of $236.4 billion, and a GDP per capita of $289,990. San Francisco was ranked seventh in the world and third in the United States on the Global Financial Centres Index as of March 2022.

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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