Lamedianaranja From Venezuela, joined Nov 2004, 1246 posts, RR: 22 Reply 3, posted (8 years 8 months 6 days 5 hours ago) and read 1997 times:
I don't really understand your question. Do you want to use your FD miles for an upgrade? Just apply, they'll let you know if there is availability or not. Even lastminute upgrades on points can be done in the lounge, if no instant availability you'll be put on C-request while having your economyseat.
Or... do you happen to have a M-class res. and are looking for a free upgrade? Then being PE sure helps. KL591 is usually heavily overbooked. But you never know until the very last moment and have to be very nice to Gate Agent