Originally Posted by
fannys
Hmm...
If your flight originates with another carrier and connects with Japan Airlines, your Japan Airlines flight has been checked in. Please revisit
JAL.com and request check in and boarding passes for your originating flight.
The JAL service center does not open until 8 uk time as far as I can see.
Meaning I should check in AY? (which is my first flight)
If your first flight is AY metal, you need to check in with AY (whose OLCI opens at T-36).
Last time I flew LHR-HEL-NRT-CGK on JL code, the LHR-HEL leg on AY metal (the rest on JL metal). At T-72 I went to JAL to do OLCI as you did, got checked in and also got the "BP will be issued 24h before departure" message. At T-36 I then went to AY website to OLCI there, successfully printed my eBP for LHR-HEL and HEL-NRT (despite the latter flight being operated by JL).
In my case, AY were not able to issue my onward BP for NRT-CGK (whether online or at HEL transfer desk), and on JL OLCI it never issued either even at <24h. But that was probably because I lucked out and got upgraded by JL on the final leg, so I had to pick up my BP at the NRT check in desk.