SkyWest has both DEN and PHX hubs, so that seems obvious. They may not be in Phoenix indefinitely, but I hear Denver is relatively junior.
Mesa has Phoenix, and it'll be expanding its operations there. It's currently the most senior base, but that could be changing - or at least becoming easier to hold - following additional US/AmericanUAL flying. Estimates to hold Phoenix range from a few months to a year. Some people have suggested it could be right out of IOE by the end of the year.
Don't know much about Republic's operations.
Last edited by deltajuliet; 07-21-2014 at 12:47 PM.