Originally Posted by
Pilot37
The upgrade with avios part won't work unless there is normal reward availability on your flights in CW, which would negate the Joker need. If there is D class availability showing on EF, then the joker will open it up for you to use a GUF to move yourself forward, have done it myself a few times.
Pilot37
Provided of course that the limit on the number of seats already jokered has not been reached.