Connection in NRT - DL to NW and NW to DL on return
I'm hoping to fly the ATL-NRT flight on DL which arrives in NRT at 2:25PM connecting to NW NRT-BKK at 6:30PM and returning on BKK-NRT on NW arriving at 2:00PM connecting to DL NRT-ATL at 4:30PM.
My question is on the connection in Tokyo since these are on separate tickets. Would I be able to check-in (also checked baggage) with DL for the NW flight and NW for the DL flight on the return? If not, I assume that I can check-in at the lounge (which one does DL use anyways?). Please also correct me if my assumption that the connection time is perfectly fine.
Thanks!!