Going on this trip in April 2020. Been watching airfares and Delta just listed their new flights to HND (they're pulling out of NRT). Initial prices are dirt cheap, relatively speaking. Just booked Delta One (biz/first) flying into HND and out of KIX for just under $4K. United is over 10K and Air Canada is 5.5K to my home airport (DEN). Don't think I've ever flown Delta before, as they have such a minor presence here, but I read good things about them.