Portsmouth, New Hampshire is indicated by which airport code?

Portsmouth, New Hampshire is represented by the airport code PSM. This code is derived from the name of the city, specifically reflecting the location of the Pease International Tradeport, which serves as the main airport for the area. Airport codes typically follow a three-letter format established by the International Civil Aviation Organization (ICAO) and the International Air Transport Association (IATA), where the letters are often related to the name of the city or the airport itself.

In this case, PSM is a direct abbreviation of Portsmouth, making it the correct answer. The other options pertain to different airports: PVD refers to T.F. Green Airport in Providence, Rhode Island; HSV corresponds to Huntsville International Airport in Alabama; and PHX represents Phoenix Sky Harbor International Airport in Arizona.