Originally Posted by
Billy Mumphrey
Phone agents can do it, it's just hard to get them to do it. They changed my father's MCO-ATL segment on a MCO-ATL-JNB itinerary to a few hours later (reducing the layover time) when I called to ask about it. I wasn't expecting it, but we appreciated it. Phone agents are unlikely to make this kind of a change for free absent a schedule change (even with status), but it isn't impossible.
While possible technically, reality is that 99% agent will refuse. Also once you check bags in it does become impossible for phone agents to do SDC.