Which of the following is the airport code for a city in California?

The airport code SNA stands for John Wayne Airport, located in Orange County, California. This airport serves the greater Los Angeles area and is a popular choice for travelers heading to attractions in Southern California. The code SNA is derived from the geographical name of the area it serves, making it a fitting representation of its location.

In contrast, the other airport codes provided represent airports located in different regions. PTY is the code for Tocumen International Airport in Panama City, Panama; PHL represents Philadelphia International Airport in Philadelphia, Pennsylvania; and PNS is the airport code for Pensacola International Airport in Pensacola, Florida. Thus, SNA clearly identifies an airport in California, distinguishing it from the other options.