I'm looking to book the following. DFW-NRT/HND-LHR-DFW in Business. Ideally JL then BA then AA.

However, when pricing it out on the oneworld website, the first leg DFW-NRT is not giving me the option of Business on JL, only on AA. JL comes up as premium economy. I thought it needed D class availability for Business?

This is the availability on JL according to expertflyer:
C9 J9 D9 X1 I0 Y9 W9 E9 B9 H9 K9 M9 L9 V9 S9 N4 Q9 O0 G0

I'd much prefer JL to AA. Am I missing something? Would calling help me book this? If so, which airline do I call?