Another thought. Cruisers may also be temped to book earlier flights due to cost? A factor to consider- they are lower due to cruise passengers not booking them. (not within the recommended timeframe) Last year a poster made a very costly mistake, booking a 9am flight that was hundreds of dollars cheaper then later ones. He didn't realize you can't just "walk off" the ship at 0700. Be certain to print out all the restrictions of your ticket and HAVE phone numbers handy if needed. It is possible some very restrictive tickets may have no value if they aren't changed before the departure.