I have taken Spirit to FLL from MSY because at the time they were the only people to fly there (Mr. travelmad478's sister lives in PBI). And once Mr. travelmad478 took Breeze from MSY right to PBI. We contemplated taking Breeze's nonstop to CHS once, because the only other option was AA via CLT, but Breeze's price was so egregiously higher than AA that we ended up not bothering. We used to fly Frontier fairly often between PHL and MSY when we were doing that commute regularly--it wasn't bad at all.