This may not be of importance to many people, but it is important to us. Because of various commitments, we try to book our cruises two to three years ahead. We always fly Business Air. With inflation, the cost of Bus Air has gone through the roof. On SS, you can book 2 to 3 years in advance and still "lock-in" the cost of Bus Air. On Seabourn, they will not lock-in the cost of Bus Air until 330 days prior to the cruise. That is a deal breaker for us. Aside from that, I like both cruise lines as long as I go on the newer and a little larger ships. Some of the upgrade charges for international Bus Air is almost as much as the cost of the cruise.