Which city is represented by the airport code PHX?

The airport code PHX represents Phoenix, Arizona. Airport codes are typically derived from the name of the city or the airport itself, and they follow a specific three-letter format. In this case, "PHX" clearly correlates with Phoenix, as the "PH" can be seen as a nod to the beginning of the city’s name, while the "X" adds a unique identifier that differentiates it from other locations.

The other options listed do not share this same correspondence. For example, Philadelphia is commonly represented by PHL, Pittsburgh by PIT, and Pensacola by PNS. Each of these codes is designed to be unique and straightforward, making it easy for travelers and airlines to identify airports quickly. Understanding these airport codes can help travelers navigate their itineraries more efficiently, especially when dealing with multiple cities or flight transfers.