Hmm, I actually track some of the luxury lines (we like small boats, would do luxury all the time if we could afford ;-) and I haven't really noticed out of season crossings or migrations. They might go to "nontraditional' (or, non-mainstream) locations, but they're still crossing the Pacific in the fall (after Alaska to Asia) or Panama Canal fall (to Caribbean) or Spring (carib to Alaska). For the Atlantic, they might do a southerly route (to South America, or maybe San Juan) but they're still going Caribbean to Europe in the spring and back in the fall. True exceptions would be those doing world cruises.....

I fantasize about a world cruise, I fantasize about a trip to Europe that is cruise ship both ways etc. So am always interested to see where it might be possible. One thing we have noticed is that certain seasons are getting longer. For instance - Alaska never used to have September cruises, and now some lines don't leave until the beginning of October (I haven't really seen any starting earlier than May, but who knows, that could be coming....) So that might explain some "off season" migrations as well.....