This seems to be a wade back into to the waters. The service as of now is second week of June to the first week of August. Basically Summer Break. I would hope it's successful enough that they'd consider extending it or consider bringing it back for Nov and Dec for Christmas season.
Hopefully, now that Frontier is going back a little of somewhat of operating mini hubs and Den that they start adding flights back like the one had.
Right now, it appears they are building Austin Tx back up into a mini hub and there's always Orlando. They seem to be building up Cincy to offer limited connections as well.
My hope is that next summer we see 3x service to DEN,MKE, AUS or DWF, and MCO.
If 412 was ever 4 laned, divided from Huntsville to Harrison, they could really find a niche offering Branson service along with supporting those flights by poaching from NWA and Springfield. I'd fly Frontier to MCO over Allegiant to Sanford any day, all day.
On the airport thread, I posted thay in addition to Denver and San Diego, they are adding San Jose California(Bay Area) and Washington Dulles.
If you have one of those Cedar Fair season passes that include all their parks, You could hit up Knotts Berry and Great America and Kings Dominion on the cheap.