This is really not AA-related, and the original question can get much more input in the oneworld Forum. I also recommend the OP read the stickies and recent threads in the oneworld Forum about RTWs, as there is lots of very helpful information there, provided by knowledgeable members.

Be aware of the different partner airline miles earning limitations (depending on fare class) and the fact using AA codeshares alone might prove costly.

This thread will now be relocated, and we wish the OP and his SO a great trip. Thank you.

FT - AA Moderator