AFAIK, only Cape Air and charters fly to VIJ.

Jet Blue does not fly to EIS, only codeshares. InterCaribbean does not codeshare, so those will be separate tickets, with those caveats. In terms of codeshare, it is Silver, Cape Air and WinAir (through SXM). We still see Liat planes - not sure where they're flying these days. It's late, so maybe I'm forgetting someone. Cape Air is still most reliable, and most expensive.

If you have four or five people, maybe charter from STT. The direct flights from Miami are scheduled in December, so keep an eye on that.