What airport code signifies San Francisco?

The airport code that signifies San Francisco is SFO. This code is assigned by the International Air Transport Association (IATA) and is widely recognized for identifying San Francisco International Airport. The use of SFO helps travelers, airlines, and airport services easily communicate and manage travel logistics for flights to and from this major international airport.

In contrast, the other codes represent different airports. For example, SAN corresponds to San Diego International Airport, SJC stands for Norman Y. Mineta San Jose International Airport, and SJU indicates Luis Muñoz Marín International Airport in San Juan, Puerto Rico. Each of these codes is unique to its respective airport, which is essential for ensuring there is no confusion in air travel.