This deal (LAX-BKK on AA or JL) has been around in one form or another for most of this year. I booked one last February for a May trip, and was able to work in a 3 night layover in Tokyo for no additional cost: $2,633, about $250 less than this. The 4K+ EQDs was very nice. Unfortunately I had to cancel. Since then the $2800-2900 rate has been available, at least when I checked. Still not bad.
The KIX connection is not necessary. NRT and HND connections also come up for me at the same price.