Hey LatinAviation,
The only info that I have is the one I got from Sta. Barbara's website (where the a.net thread info comes from). The only thing that I can add is that I suspect that the Transmeridian's 757s are the ones previously used by Air Santo Domingo before they pulled out of MIA.
I plan on flying to MIA in July. Right now my first choice is Aeropostal at 333$. The other choice I got is AA at $375 (both roundtrips).I'm anxious to know what will be Sta. Barbara's price for the route.
I'll try to find out from some friends if they know the date of the arrival of the B757s in CCS.