Originally Posted by
SUPERTRAVEL
Do we open up the existing reservation and there's a link that allows the free companion to be added?
Once you designate your companion, yep.
Originally Posted by
SUPERTRAVEL
Usually a PNR with one name can't be changed to two names so that's what I'm wondering.
Your companion will get a separate PNR. You will have to check in both separately. Check in yourself at T-24. Southwest has recently changed it so you get consecutive boarding numbers with a companion, so you don't have to worry about checking in your companion right at T-24.