That's a good point, Chuck. If I tried to book my EIS trip on a single ticket with Delta it was much more expensive than booking my trip to SJU and then purchasing a second ticket for the SJU-EIS segment. I broke mine into 2 tickets for a couple of reasons; cost was less and I had more flexibility in itineraries. Sometimes with Delta I would have a layover of 3 or 4 hours if I used a single ticket. With 2 tickets, I could pick whichever carrier was leaving first and I change between InterCaribbean, Silver, and Air Sunshine.

2 tickets comes with some risk but it was worth it financially.

Cheers,
Jason