Originally Posted by mattking2000

Are you transferring immediately at CDG from AC to AF? If so, you can check in your bags through all the way on the outbound, since AF and AC are interline partners. This way, you can save $45 on the way there, but you will still need to pay the $45 on the way back.

I have done this with two tickets before, you just have to be able to show AC that you have onward travel, so print our your ticket for AF and show it to the agent when checking in.