Thanks, Guys!
My first leg is on Delta and land in HND then hop on Jal to china.
I checked both flights will be in terminal 3 so at least no transit bus…
If on time and I can get through immigration and get luggage in 45mins-1 hr, then go around to check in again, should be ok.
I doubt Delta can and will check my luggage through with Jal as they are not in the same alliance.
I used to check through on Delta and Korean air line or klm buying separate tickets.