I am on a DXB-JFK reward ticket-- F out and Y inbound.

At time of booking only F flex outbound and Inbound was Y Saver and J Flex avail. I figured I would changed the inbound to a J saver closer to the time if it came avail.

So today I check (flight is today) at T -7hr and Saver Biz avail-- I tried to change over the phone and told once travel has started only can change date and this is from Jan 1.... So I figure I will do at airport or lounge-- just tried at lounge and Reward Tickets are "blacklisted" from upgrading.

These may be in the "New" rules but I dont recall seeing anything like that-- although I am not claiming it is not there. Just a warning really to all that the change of class cant be done after the outbound.