Far as I know - Delta and Southwest are the only two. Last time I went (on Southwest) I had a short layover in Houston. (Or you might bounce through Nashville.) Delta was about the same price for the ticket - but they add a ridiculous charge for checked baggage, starting with the first bag.
The new "code" for the airport is ECP - might check the various cheap-ticket sites and see what they can do for you from (whatever your local airport is). It would be faster - but you would need wheels. I'm sure there is a shuttle from way out in north bumphuque where they put it, but PCB is "spread out too far" to be walking all the time. The traffic will give you nightmares anyway - but at least you would be in charge of your own misery
If you end up coming this way - I'm sure one of us would be able to give you some tips about how to avoid the "worst of it". One beep-and-creep trip along front beach is enough for about anybody.
PG