Originally Posted by
channa
Last time I flew it, I was on a K fare anyway, so I tossed the GGU on there to confirm it. 6 hours is too much to risk. Started chatting with a fellow pax, and he was a MVPG and he got the freebie upgrade on a cheap ticket. Oh well, I burned my GGU for insurance. It's hard to predict how it's going to be on any given day.
I've been paying ~$750 RT to upgrade to F in advance when it's available which it usually is a few weeks out.