Flight
Phoenix Sky Harbor is definitely the most central airport to fly into. We recommend Southwest. This airport is equidistant to the Moor and Mentzer households (about 20 minutes).
Flight
The Phoenix-Mesa Gateway airport has convenient direct flights to Great Falls on Allegiant. This airport is closer to the Mentzer home (about a 20 minute drive) and further from the Moor residence (about a 45 minute drive).