What if my Aeroplan J reward looks like this....
TNR-->IST (TK in J)
IST-->FRA (LH in J)
FRA-->YUL (AC in PE)
I doubt I can ask a TK or LH agent to put me on the AC upgrade list when I am in TNR or IST. Can I facebook message AC before I get to FRA to waitlist for upgrade, or do I have to ask the AC gate agent to do that once I'm in FRA? Can I get into AC MLL in FRA even though my boarding pass is for PE to YUL?