Well, just let me say out of my ten cruises on O, I think two of them have stuck with the exact itinerary listed when I booked the cruise. My other cruise experiences on Celebrity, Crystal, Princess, HAL, and Regent, I can remember five times itineraries have been changed and two of those were on Regent which is also owned by NCL Holdings and shares some staff with O. I believe there are many times when it is a close call weather wise, O always makes the more conservative decision. Just my opinion based on experience.