Originally Posted by
CPH-Flyer
There is no business class on JAL domestic, there it what is branded as Class J, which is just a wider seat and one extra option for the drinks selection, but as it can often be bought at the airport day of departure for 2000 yen (used to be 1000) it is not a bad deal. See it as a premium economy product. It does not come with lounge access. Nor does it offer extra luggage allowance.
JAL does offer domestic first class on A350s and select 767s. First class comes with lounge access, extra luggage allowance, and full catering.
Domestic first class is offered on 787-8 as well