BNE-NRT-BNE both sectors on aged B767-300 operated by Jalways crew. The cabin seats 6 abreast which felt too cramped for a business experience - seats are showing their age with limited functionality and no better than a domestic business class or international premium economy seat. Adequate for daytime flight only. The Magic-III inflight entertainment system worked - however I was disappointed by the range and selection of movies available. The in-flight service differed dramatically. On our flight to Narita we had a wonderful crew led by a Thai-based purser - hard working always in the cabin and a wonderful inflight experience which made up for the substandard cabin. On our return it was the opposite. The service was chaotic and disorganised. The business cabin was full and it was over 2 hours after boarding before we were even offered a drink. This is an overnight flight departing Narita ~2130 so the entire meal service should have been completed by 2 hours into the flight to ensure we had sufficient time to rest. However we hadn't even been offered a drink. We were exhausted after travelling in from Los Angeles so my partner walked down to the galley and requested a snack and a bottle of water. This was promptly provided for us but you could tell our request was not appreciated. The cabin temperature was hot during both flights and the air quality seemed stuffy and overly dry. Requests to lower the air temperature was denied as I was quoted "that the Japanese passengers feel the cold". Overall if flying JAL again on this route I would save the money and fly economy.