I have a related question.
So while I flew a ton this year on AA for work in the US, I only have enough JAL miles to ding my JGC over to JGC Crystal for 2018.
I have an already booked RT to Sapporo on 12/26 that'll push me over the line. However, I was debating going to Aomori on 12/23, looking at that mileage, that'll push me over the line to hit JGC Crystal too.
So my question is, is hitting JGC on 12/23 via the Aomori RT going to actually reflect when I fly the Sapporo RT on 12/26 and get the bonus miles, or not enough time? And if not enough time, how long for JAL systems to reflect the change?