Since you are on one PNR from DFW-ORD-NRT AA will probably NOT short check your bag to just ORD....
However, AA may check the bag through to TPE even though on 2 PNRs. Be sure and bring printed proof of the NRT-TPE PNR to show the DFW AA agent.
Good news: At ORD, AA and JL share the same Terminal 3 for this direction of your trip (not so for return to USA).
Last edited by roberto99; Feb 2, 2018 at 2:51 pm