Which city is represented by the airport code PNS?

The airport code PNS represents Pensacola, Florida. This code is an assigned identifier used by the International Air Transport Association (IATA) for Pensacola International Airport. Each airport has a unique code, often derived from letters that correspond to the phonetics or noteworthy characteristics of the location or its name. In this case, PNS specifically relates to Pensacola, making it the correct answer.

Regarding the other options, they all correspond to different cities and airports. Palm Springs has its own code, PSP; Providence is designated with the code PVD; and Norfolk is identified by the airport code ORF. Each of these codes is unique to their respective locations, which helps in efficiently managing air travel logistics.