Drich--how much more would you have to pay to book AA all the way? If it's not more than $100 a person, I would do it. Spirit is very unreliable, and if they end up cancelling on you or something else happens, they do NOT cooperate with any other airlines, and they will say your only choice is to fly a week later, as they only fly on Saturday. Or buy a last minute ticket on another airline.

I have flown Spirit several times in the past, and they actually did deliver me where I was supposed to be, including to SXM, MANY years ago, and to St. Thomas, also many years ago. I have also used them a few times within the US. Their seats are uncomfortable, you have to pay for seats, bags, etc. All of that is a given. But the thought that a trip to SXM could be blown up and totally destroyed by not being able to get to SXM until a week later than I planned, I just can't deal with, at this point. Your mileage may vary.