Originally Posted by
jsloan
So, if you stick with the idea that SDC merely a change fee waiver: in order to have your fare be applicable for the new flight, you'd need availability in both the underlying economy bucket and the business / first bucket.
That's certainly not accurate.
It's also a fare difference waiver*
Changing from a 30 day advance purchase W fare to a W fare with no advance purchase requirement would normally have some additional collection.
*As long as the fare class is available.
But as far as I know, you can only have one RBD. Fare rules can require whatever they want, but if my RBD is P, then my RBD is P.