Check with Dolphin Water Taxi. They may be able to accommodate your late arriving crew. Google their website and hit up the live chat. They were very responsive when I was making arrangements. 5:30 arrival is a little late, but again, they may be able to take care of you.

We are also flying down the beginning of July on Delta from JFK....arriving STT around 12:30. I'll have to check to make sure they haven't monkeyed around with that flight. Part of our group is flying in from Denver. I'll have them check their flights too. Hope you get it worked out.