Old Jun 18, 19, 10:20 pm
Join Date: Apr 2012
Location: Hong Kong SAR
Programs: JL Diamond, CX Gold, HH Gold
Posts: 207
Your miles and FOPs would be credited 2-3 days post-flight, and status will be changed on the next day after FOP threshold reached.
They won't be able to know you reached a new tier in flight.

In fact, there are way too many JGP around the globe - I doubt you will feel 'being special' while flying as JGP on JAL.
AmD950 is online now