Originally Posted by
acf1270
I was wondering if at the time of requesting the change that if there is no longer availabilty in the original paid fare class on the new flights, maybe the agent is forced to book them in Y. Maybe if you were booked in L and the new flights show L0,U0,T0 then the agent has no way of booking you into those classes.
In that case, the agent is not supposed to allow you to SDC at all. At least according to some fare rules. A T fare I just bought has a stipulation that to SDC, the new flight must have the same fare class available (i.e., T fare).