Blue City Airport Codes Practice Test 2026 – Complete Study Resource

Airport codes like PHX are IATA three-letter identifiers that airports use so flights and schedules can be recognized quickly. PHX specifically designates Phoenix Sky Harbor International Airport in Phoenix, Arizona. When you see PHX on a boarding pass, a display, or a ticket, it points to that airport and city. Codes are usually built from the city or airport name, often with a twist to keep them unique, which is why PHX is tied to Phoenix rather than other cities. For contrast, Nantucket’s airport uses a different code, Raleigh/Durham uses another, and Providence uses yet another, illustrating how each city has its own distinct code.