I was going to use my Southwestern Flight Pass for an April trip from YEG to LAS. On the way back, the flight is LAS-YVR-YEG. Now I need to be in Vancouver around the same time so I was wondering whether I can stopover in YVR for a few days before heading back to YEG - does anyone know the fare rules for this flight pass and/or whether I can do this at no additional cost? It's a flight pass that books into M fare if that is relevant info. My other thought was maybe I just book the flight and then pay the change fee to push the YVR-YEG out a few days. I assume that would work?