<a href="https://travobravo.com/sun-country-airlines/what-terminal-is-sun-country-at-phx/">What Terminal is Sun Country at PHX</a> ? Sun Country Airlines primarily operates out of Terminal 3 at Phoenix Sky Harbor International Airport. Terminal 3 is one of the three terminals at PHX and serves both domestic and international flights. It underwent significant renovations and improvements to enhance passenger experience and accommodate the growing number of travelers.