Will try the new intra-Asia routes that serves F on JAL, after
getting the information that JAL serves their 777 from HND-BKK, I went to book it via Avios and cost me around 51.500 for one way trip.
I choose HND-BKK segment instead BKK-HND, since I would like have an experience with JAL F lounge, also take a sip of that Salon Champagne!
The availability to redeem this segment its quite rare I can say, I found that around May 2024 there's much availability.