Thanks for all the advice,

I will be contacting AA RTW in the next few days to book and finalize details.

With regards to the YVR transit it is seen as doable on the Oneworld planner as long as it is not booked as two tickets i.e LAS-xDFW-YVR and then YVR-xJFK-MIA.

I will inform back what AA think about a USA-YVR-USA transit.

J