Originally Posted by
Roar
I actually have a LHR - IAD ticket right now for a separate trip in July, and I can't even see that there is any way to buy up. I can see where I can upgrade using miles and cash, but not the pure cash buy up. (It's grayed out.)
You have to call and ask. I do this quite a bit. The change fee is waived when moving up a cabin, so you're paying only the difference in fare. See:
http://www.flyertalk.com/forum/unite...-gg-buyup.html