Midway is already an international airport and my understanding is that LeGuardia has distance restrictions that could come into play regarding SXM. I still don't see there would be any nonstops that would come into being because of being able to be a 'domestic' flight. Now there definitely would be advantages of not having to clear C & I upon the first landing in the US, but I still don't see how that is going to increase the number of visitors though.

Thanks for the info regarding stay over visitors, which I had no idea what the number was.