Originally Posted by
JALPak
You need to firm up your plan isn't a reason for them to clear it for you. Just redeem a C/PY/Y award and waitlist for the F assuming they allow you to do that.
It's not, but I figure they can forward a email request to see if they'll open up a seat or something. I've never redeemed JMB miles before and thought they have special priority for JGC members.
I don't think changes are allowed on award per the new rules, it will require cancellation of the existing then issue a new award, plus applicable fees.