so bringing old thread to life, i'm guessing Japan Airlines a lot more conservative with their op-up policies? Unlike CX who always tend to over-sell if upper cabin is available, anacdotally I hear much less stories of JAL op-ups.
have dilenma of upselling my ticket to PEY as I need to extend trip duration HKG-HND... but cost of upsell is more than HKG-NRT on sale fare (on E01 787 equipment) so just thinking maybe I purchase another ticket to fly back/forth (back to back connecting in HK) with @
Hope@ maybe Y=>J is possible (i'm OWE)