Trying to Understand Availability of BE seats
I'm on an M fare, HNL-NRT-BKK using miles to upgrade to BE. When I booked I used the Delta seat chart to determine which days had the most BE seats available at the lowest M fare. Got 3 good days out and 2 good days return for multiple seats on all legs. When I called to book I was told that the return legs BKK-NRT were not available on either of the 2 days, though the seat charts showed (at that time) 20 and 19 open seats (out of 32). Okay, I finally booked that leg in Coach, 29A, and was put on Standby Z, all this showed up on the confirmation email. I asked about calling and they said it would show up on my Account info if it happened, or an agent along the way would advise me if I was traveling already.
I leave Weds, no upgrade so far. I went on Delta.com and checked a One Way BKK-NRT (DL296,4/8) for the flight in question, just to see. It showed NO availability, with 16 open seats in BE. I searched for a B/F seat, it returned only Coach availability. Is there some other way to search to determine actual availability? Why would the seat map on the website be incorrect to the extent that it would show so many available seats?
Just curious, still trying to figure out Delta.
I flew this route 10's of times with NW, this is the first time I have ever not been confirmed upfront while paying a Y/B/M fare and using miles or certs.