Originally Posted by no1cub17

Hello all, have a question on how cash and miles upgrades work.

I'm plotting out how to upgrade DFW-HKG with cash & miles as part of our honeymoon next year. I'm wondering how those work - obviously on a space available basis - but do we know which inventory those upgrades come from? I don't have EF at the moment but am thinking of subscribing just because I want to make sure we have as good a chance of upgrading those legs as possible. AFAIK DFW-HKG isn't bookable yet but we basically have our honeymoon dates set, so literally the first day it's available for booking I'll probably hop on (I imagine a bunch of others will be doing so as well).

TIA!