a couple years ago, CX agent told me a could pick my segment as the 7th. i.e. the M segment.
(i had all A class in NA, and M for BOS-NYC, with a D ticket).

all OW airline can re-issue the ticket for you. call up AA RTW or CX office to make the rebooking, ask them to insert a note that you will re-issue. then go to the office/apt to do the reissuance.
you will have to pay 75$ re-issue fee + ($150 or whatever it states for ex-CDG tkt) for the extra segment.

you have to pay for that segment, but it is for M class, not D class.
(i am not sure if it would be 150$ or 100Euro, but since you ticket was ex-CDG it and was paid in Euro, so should the surcharge)

[This message has been edited by pegasus8228 (edited 11-08-2002).]