My current itinerary is SFO-SEA-FAI, connecting through Seattle for 14 hours, though both SFO-SEA and SEA-FAI depart on the same day.

I'm MVP Gold, and I want to change the second leg, SEA-FAI, to an earlier flight. I saw that the SDC rule allows me to make the request during online check-in. Does that mean that I'll be able to request changing the second leg 24 hours before the first leg? That would then be 38 hours before the flight I want to change...

On a related matter, am I automatically waitlisted for complimentary upgrade after I do SDC? Thanks!!