Sun Country and Spirit Airlines are relocating from Terminal 3 to Terminal 2 as part of the Terminal Modernization Program.
Sun Country flights began operating out of Terminal 2 on April 8.
Spirit Airlines will operate out of Terminal 2 starting on April 16 at 6 p.m.
If you're flying on or around these dates, be aware that you may depart from one terminal, but return at another terminal.
By summer of 2016, travelers will have a larger consolidated security checkpoint to get to gates faster. Modernized ticket counters will make the check-in process more convenient.
The renovations are the first of three phases in the $590 million redevelopment of Terminal 3.
The Phoenix Aviation Department expects the first phase to be finished by summer 2016 and the entire project to be completed in 2020.
For more information on the changes at Terminal 3, visit skyharbor.com/terminalmodernization.