The ultra-low-cost carrier Frontier Airlines has been expanding at Phoenix Sky Harbor International Airport in recent years.

Frontier operates nine operational bases, each serving a key purpose for the carrier's network and operations. By summer 2024, Frontier's operational bases will include cities like Atlanta, Dallas ...

via Sky Harbor. Phoenix is one of four new cities Frontier added out of Austin Bergstrom International Airport. Nonstop flights to Austin will begin March 7, coinciding with the start of the South ...