I don't really have a handle on how many charter boat customers fly down each day. I know the number would be greater on the weekend. It would be interesting if a charter company much like cruise lines would pair up with a Airline flying the CS100 to offer direct service. The aircraft could make that flight easily from any eastern US hubs. Delta has them on order and JetBlue is rumored to be considering the airframe. A charter company could offer package prices again like the cruise industry.
If they were smart they would connect baggage from the departure to boat and boat to destination. It could easily be done. Imagine checking your bags leaving the US and having them arrive on the boat shortly after you. On departure you place them in the cockpit and they go to your final destination. I believe customers would pay a substantial premium for that type of service beyond the ferry cost savings.
G