Frontier Airlines PHX Terminal a variety of facilities are available at this airport, such as shops, dining options, and cozy seating places. With a range of domestic flights as well as certain international destinations, Frontier specializes in low-cost travel. For convenience, travelers can use mobile boarding cards and online check-in. With its obvious signage and friendly staff on hand to help, Terminal 3 is made to be easy to navigate. At PHX, Frontier Airlines guarantees a seamless travel experience for all travelers, whether they are traveling for business or pleasure