Originally Posted by
mduell
That's not how they've implemented it.
I've never had (normal) SDC change my fare class. (I have had a change to Y in IRROPS SDC, but that still credited as the original class.) Even the one time I asked an airport agent to do it for me - still the original fare class.
I've actually done 2-3 day rolling SDC a few times now, no issues whatsoever. Even once on a connecting ticket (turned a layover into a 1.5 day stopover).