My wife and I flew LAX/KOA and back earlier this month with the lie-flat seats. I agree they are great (especially on the red-eye way home). The last day for this aircraft on this route is April 6th.
We couldn't decide between OGG and KOA and ending up choosing KOA because of the lie-flat seats
I have no idea why this plane showed up for a time on this route. I've never seen lie-flat from LAX to any Hawaii city (except HNL at times with a 76W). Maybe the plane would have just stayed in LAX for the night (RON I believe what this is called) and Delta tried it. I'm guessing this plane is usually LAX to JFK and back.
Unfortunately, I don't think it is going to be the norm for LAX to any Hawaii city.
Happydad