Thank you for the responses. I knew that people on this board would be in the know and up to date

I don't fly very much and this will be a first going to California. I really love flying out of Flint whenever I can, it is such a nice airport with easy access and not so overwhelming. It is close to the same distance for us to go to Flint or Metro (yes, we are in the Port Huron area).
Any idea when the release dates for fall will be? I see that Southwest will have the first leg of our flight released on 2/20, but could not find anything on Frontier's site. Both Frontier and Southwest seem to have very reasonable rates. Any preferences here?
Again, thanks!