Thanks for the guidance. I think I will taxi to a local health club in between flights.
I was pre-assigned one upstairs and one downstairs J seats. Should I leave this "as is" and experience one of each or try to get both in the upstairs cabinn both ways?
I book on AA.com - is it better to call AA or CX for seat request changes?
Any way a "One World Nobody" (until this trip is completed) can nab the coveted 86A or is this out of the realm of possibility?