As we all know AC pretty much zeroes out R space based on some historical calculation about how many actual J seats they will sell on a given flight. Which, in my opinion should be good business practice. I am flying back from HKG in the next few days on a "B" fare and was only able to ensure my upgrade at time of booking on the flight via YVR. However, upon doing a KVS chaeck over the last few days R seats appeared on AC16 the non stop flight to YYZ. So, instead of getting home at midnight I now arrive at 6PM and can have dinner with my spouse. The message is to keep checking the flights you book on as R space does REAPPEAR at times. Having a latitude ticket (which only cost me about $1K more than Flex at time of booking) makes a possible flight change pretty painless but it would help a flex flyer as well closer in if R reappears.