I'm on JL11 MEX-YVR next week using an AONE4 ex-MRU. This is a 2 class (business/economy) service and seat 1K was allocated to me many months ago. Recently JAL replaced the 2 class configured B747 on this flight with a 3 class version but it is still being sold in 2 class mode. This resulted in me losing 1K and being allocated 11A. I phoned JAL to find out why I couldn't have a seat in rows 1-3 and they said that those seats (old style first class seats) were reserved for their top tier frequent flyers. I pointed out that I was a OneWorld Emerald and should therefore be eligible for a front cabin seat. After a few moments of investigation they discovered that my AAdvantage FF number had not been passed through to the JAL reservations system from the BA reservations system (where the original reservations and ticketing originated). I have now been allocated 2K and look forward to enjoying the first class cabin & seat on this business class flight!

However, I am left wondering if anybody else has experienced problems with transmission of their FF number from the BA to JAL system? Or was this just a weird one-off occurence?