So if I want to go on a trip for the weekend and I don't care really where I go. Say I book a flight to SFO but miss the flight. They would simply roll me over to the next flight and I would be at the top of the D2 or D1 list (if I signed in 24hrs prior). If you miss a flight they don't just cancel the PNR if you are there.

Question. If I didn't get on the SFO flight could I roll that PNR to a LAX flight?