I booked a round-trip Frankfurt-Osaka with Finnair, but the return flight is with JAL (flights JL numbers, JL3002 and JL407). Is there any option at JAL homepage to upgrade the booking class prior to the flight? Checking Finnair site I can't do any changes for this part of the iteration, and at JAL site I can only choose seats, nothing more.
So I can only upgrade to PE at the airport, if available?