Total time for both itineraries is about 14.5 hours.
AA says DFW-LAX-CDG can be done with 1 award so I guess there is a published TN fare.
Ready2Go I had not given serous enough thought to the issue of changes which you brought up, and this is obviously an important factor. There is always a possibility of a more favorable routing becoming available on other days (including in my wildest dreams a seat on AA's DFW-CDG non-stop) and to be able to make the change would be a great advantage. Does anyone know if AA (OW) considers CDG/ORY co-terminals?
After reading some more comments, I agree, I think service on IB Business Plus may be getting a bad rap.
Many thanks.