Agreed that they are normally more expensive if you don't have to check backs. Without that savings they do always seem to be more expensive. I have been assuming that it was just flights from Dallas because they are basically 2 flights, but from what you two are saying it looks like its that way across the board.
However, I can say that my sister and her family got cheaper flights to Ft Lauderdale from Chicago than on any other airline for our cruise next week. Of course she booked as SOON as those flights opened up for sale. I doubt the cheaper seats lasted long.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013