This happened to one of our guests last year. They arrived late afternoon and her bag missed the connection in Atlanta. Her bag arrived in STT the next day and Delta got it to the ferry. But it was on us to pick up the bag when the ferry arrived at 3PM.

Fortunately, we were in a slip at Scrub when they arrived so we just extended an extra day. We lost a day of sailing but at least were able to enjoy the beach and pool at Scrub.