I get the distinct feeling that international travel really would not be in line with the modeling that "fast turn around" carriers like WN employ.
I remember when I was flying to BGI a year or so ago, the plane was about 20 minutes late getting into PHL. The aircraft was originally scheduled to be at the PHL gate for about :50 or so minutes. I figured that with the extra "pad", the flight would still be able to leave on-time.
However, I was told that the plane requires certain inspections before the flight can depart on an international routing. Thus, it seems that is is virtually impossible to do a quick turn on these types of routes. And, since WN emphasises quick turns and maximization of en route time, the necessary hurdles might deter WN from attempting the venture.
BTW....What's the word with Caribbean Star???? I thought that they were supposed to be codeshare linked by now.