I made a reservation for relative on United domestic flight. She is *Gold via partner airlines. At check-in, I can see options to take other flights (before and after her scheduled flight), confirmed for $0. As a general member, I've never seen these options presented to me. Is this a *Gold perk? Please note that this is only available via check-in process. When I try to use change flight under manage reservations, we still see the change fee, fare difference and all.