We are reluctantly booked on Spirt since they had by far the best schedule from BWI. They just informed us that they extended our trip by a day. We were supposed to return home on Wed 10/4 now it's 10/5. Hoping BSV can accomodate the extra. Hopefully not a problem in early October.
If you are ever going away for a longer amount of time you should always check getting a 1 way car rental from a nearby location to the airport. Can do do the same for returning home, sometimes cheaper and still convenient versus parking at the airport.
We do this all the time. Rent at a local agency on the beach where we live and drop it off at the airport the next day. We live in the Tampa area and usually drive over to Fort Lauderdale the day before and stay overnight. We have dinner at our favorite steakhouse and call it a night. Next morning drive to airport and drop it off. It's worked for us for years--through JetBlue and now Spirit (wish JB still doing it, but it is what it is). Most of the time now we just fly from SXM to TPA, pick up our car and drop off at our local beach agancy.