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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.

Hefei, referred to as Luhe, Luzhou, Luyang and Hefei in ancient times, is the capital of Anhui Province, the deputy center of the Yangtze River Delta urban agglomeration, a comprehensive national science center, a "Belt and Road Initiative" and a strategic double-node city of the Yangtze River economic belt, an innovation capital with international influence, an important national scientific research and education base, a modern manufacturing base and a comprehensive transportation hub, and a central city in Hefei metropolitan area.
Airport In Hefei、Ho-fei - Hefei Xinqiao International Airport
Hefei Xinqiao International Airport (Hefei Xinqiao International Airport, IATA: HFE, ICAO: ZSOF), officially opened to navigation on May 30, 2013, is located in Gaoliu Street, Shushan District, Hefei City, Anhui Province, 31.8 kilometers away from the center of Hefei, 4E level international airport   , a regional hub airport, a member of the East China Airport Group.  
In November 1977, Hefei Luogang Airport officially started operation. At the end of June 2006, Hefei Luogang Airport was officially upgraded to an international airport after being checked and accepted by relevant state departments. At 24:00 on May 29, 2013, Hefei Luogang International Airport, which had been in safe operation for 36 years, was permanently closed. At midnight on May 30, 2013, Hefei Xinqiao International Airport was officially opened.  
According to the information on the airport's official website in December 2017, the runway of Hefei Xinqiao International Airport is 3,400 meters long and 45 meters wide; there is one terminal building with an area of ​​108,500 square meters; the area of ​​the station is 360,000 square meters, with a total of 53 seats , including 19 bridge seats and 34 remote seats. It is designed to meet the needs of 11 million passenger throughput and 150,000 tons of cargo and mail throughput in 2020.      
On November 26, 2018, Hefei Xinqiao International Airport exceeded 10 million passenger traffic, becoming one of the "10 million airport clubs". This is another historic breakthrough after crossing 8 million and 9 million in 2017.  
During the National Day in 2019, Hefei Airport further optimized the service process, improved the security plan, opened more security check channels in a timely manner, reduced the waiting time of passengers in line, and focused on strengthening personalized services for special groups such as the elderly and children.  
In May 2022, the pouring of the 1,000th engineering pile foundation of the T2 terminal of Hefei Xinqiao International Airport was completed, marking a new step in the expansion project of the terminal area of ​​Hefei Xinqiao International Airport.  
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