Originally Posted by
KAFlyer
You've successfully added companions (without status) on a separate PNR to the gate wait list? Are you sure? That's contrary to everything I've read.
I am very certain of it

And yes, it was on UA ... and yes, recently as well. Where are you reading this is not possible? It is automatic when on the same reservation, but I have most definitely had GAs put a companion into F when they had unsold seats prior to departure.