Oh I was not aware of that, so someone else could go with me for just taxes now? Does it still work that way if I got an interline rate? I am very interested if this is the case.
edit: I did the 4 night Bahamas from JAX on Sept 22nd with Carnival. Got it for $398 with taxes and a promise that if the price drops again before the cruise they will move me to "main deck" whatever that means for free.