Originally Posted by
TravelingZoomer
Is it possible to connect in Tokyo on separate PNRs without leaving the airport?
As CPH-Flyer noted, be one of the first to check in at your origin as there will be a lot of scrutiny of the rules and your paperwork.
FWIW, I was able to check luggage on separate PNRs transiting NRT JL->EK - but this is by no means guaranteed.