Lots of understandable speculation and interest here (which I share) re whether it will be possible to change travel dates for simply the $100 change fee. Right now it seems very unlikely, given that (as I understand it) the A fare (and equivalent business class fares) is mostly or completely unavailable for the routes for which this great deal was offered.
But for those seeking a glimmer of hope, here's a post (#143) from the other thread discussing this situation, over at the CX forum:
CX is indeed heavily restricting F inventory, though I'm not sure that's entirely intentional. When I was on the yield team in RM, there was a mechanism that automatically pushes the inventory upwards, or gates a certain fare class when there is usually high demand. I suspect that the strong restriction on A is a result of such mechanism kicking in, and availability should normalize in the next few weeks once the system picks up on the lack of demand
I don't know enough to know whether this expectation is in fact valid, but thought I'd share it here.
And here's the thread itself, which provides some useful information and interesting perspectives:
https://www.flyertalk.com/forum/cath...nam-us-10.html