I'm under the impression that they are "flying by the seat of their pants" with these excursions. The system lets you waitist an excursion and book another included available (backup) but charges you for both, one should be included . When we waitlisted the system didn't tell us they added new time slots. I went back and deleted a few days and rebooked with what we wanted. When we booked the cruise in Feb (Dec cruise) one port had no inlcuded excursions now it does. Its very important to keep checking.