Perhaps something covered a few years ago but quick search and I didn't see anything.

We (wife, infant in lap) are on lih-sea in early may, the return leg of a companion pass ticket. Upgraded with gold certs. Companion pass is from my card and mp account, but she has a cc by the same number, and is an MVP. All good.

I now have to be in dallas that day. Bummer. LIH-SEA-DFW (the redeye) looks like the best schedule which is nice that it's still alaska.

Two options I can think of - 1) change our tickets to the day before and split off from the fam when we hit seattle, book a separate ticket sea-dfw. (and lose the upgrade plus pay her change fees and re-fare ) or 2) book my own separate ticket lih-sea-dfw (i'd book in paid first, it's work) the day before, and leave our booking intact - wife and infant then fly home and I am a no-show. The question becomes if my no-show will be an issue for her.

The added negative to changing our ticket is we're out there with her folks and they're on the same flight that we're on... so then the question becomes if they should change too to help with the baby, or if she has an issue she'll also have them on hand.