San Francisco, the Fourth Most Populous City in the State of California, in the United States, Is Known for Its Resilience and Capacity for Renewal.
After being devastated by an earthquake in 1906, the city quickly rebuilt itself, transforming into a renowned tourist destination and one of the major financial centers of the United States.
Today, San Francisco is home to more than 30 international financial institutions and stands out for its efficient transportation system, including the San Francisco International Airport (SFO), a marvel of modern engineering.
San Francisco International Airport: A Global Hub in Expansion
Located 21 km south of downtown San Francisco, SFO is the largest of the four airports in the San Francisco Bay and the second busiest in California, surpassed only by the Los Angeles International Airport.
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During the construction of the world’s highest bridge, the Huajiang Bridge in China, engineers discovered a giant aquifer and turned what would have been a serious problem into a 625-meter artificial waterfall, an engineering feat that no one had planned.
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The river rose 15 meters overnight and devastated a village in Vietnam in 2025, and Japan responded with dams that hold back mud and stones, training 15,000 people for evacuation, and a sewage station for 1 million residents.
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Russia erected the tallest building in Europe on ground as soft as quicksand, on the edge of the Gulf of Finland, with 264 piles of 25 meters, 30 thousand tons of steel, and 16,500 glass panels curved one by one in Saint Petersburg.
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A mother of four sought a safer family environment, watched tutorials on the internet, built a 325 m² house with her family, and learned foundation, walls, plumbing, and electrical work without any professional experience.
With flights to North America, Europe, and Asia, SFO is an important transpacific hub for United Airlines and one of the busiest airports in the United States.
The History of SFO Dates Back to the 1920s, When San Francisco Foresaw the Construction of a Terminal for the New Transcontinental Air Mail System
In 1927, the airport began operations as Mills Field Municipal Airport, quickly evolving to become a training center for the U.S. Army Air Forces during World War II and later one of the country’s major airports.
Over the years, SFO has undergone investments, various expansions and modernizations to accommodate the increasing number of passengers.
Notable highlights include the construction of the South Terminal in 1963, the expansion of runways to accommodate jet aircraft, and the inauguration of the current international terminal in 2000.
More recently, Terminal 2 was remodeled, becoming an example of sustainability and comfort for passengers.
Despite Its Success, SFO Faces Challenges, Such as Increased Noise Due to New Flight Routes
Legislation seeks to address these issues, aiming for soundproofing of nearby residences. The airport has set a goal of achieving net zero carbon, zero waste, and net zero energy, although the projected increase in passenger traffic represents a significant challenge for these objectives.
Comparing SFO to the Guarulhos International Airport, the largest in Brazil, similarities can be observed in size and passenger volume, although Guarulhos receives a larger number of travelers annually.
The San Francisco International Airport is more than a transit point; it is a complex of commercial and cultural attractions. With a history of nearly a century, SFO remains one of the most important airports in the United States, promising a bright and innovative future.

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