Originally Posted by
LapLap
If you’re using miles (at least this is the case with BA Avios for JAL flights) it’s pretty generous giving 2 x 23kg bags in economy.
If not, the takkyubin delivery service can iron out any problems.
Same if using JAL's Japan Explorer fare, or both JAL and ANA apply international baggage allowance to domestic sectors on a single ticket I believe. ANA does the same for their Experience/Discover Japan fares.