PHL is the airport code for which city?

The airport code PHL stands for Philadelphia International Airport, which is located in Philadelphia, Pennsylvania. Airport codes, also known as IATA codes, are three-letter designations assigned to airports around the world, and each code corresponds to a specific location. In this case, PHL specifically identifies Philadelphia, making it the correct answer. This code is widely recognized in the travel industry and consists of the city's name, helping travelers easily identify their destination.

The other airport codes such as those for Phoenix, Pittsburgh, and Providence are distinctly different and do not share the PHL designation, emphasizing that only Philadelphia is represented by this specific code.