Hi, I'm booked to fly LHR - MIA with my partner on 23/12. I tried to upgrade our tickets to Y+ using airmiles, but wasn't able to because I had the wrong Y fare. (If I had realised this particular fare wouldn't let me upgrade with miles, I would have booked a different one). Anyway, I see the flight is full to capacity. Under these conditions, do you think they will let us upgrade with miles to release seats in economy for others? Fingers crossed they will!! Any tips from VS staff greatly appreciated.