What city does the code SFO refer to?

The code SFO is the airport code for San Francisco International Airport, which is located in San Francisco, California. Each city typically has a unique airport code derived from its name, often using the first three letters. In this case, "SFO" stands for San Francisco. This is particularly useful for travelers and airlines in identifying specific airports quickly and efficiently. San Francisco is a major city known for its landmarks, culture, and significant tourist attractions, thus making the code widely recognized in air travel contexts.