Originally Posted by
pushmyredbutton
What class did it book into for you? That's actually really interesting and good news if true. Mine required O and booked into O; wouldn't even let the request go through without it for my other one
It books into O, but that's not the same thing as requiring O.
For example, to upgrade Air Canada Y/B fares, you need P space available, but it books you into R when it's confirmed.
I know for a fact that there was no O space on my flight when I upgraded mine, because it was the first thing I checked too.