Why risk flying on AA and perhaps, if the stars align and if all their Herculean efforts are brought to bear you might get a level of service that loosely approximates what JAL does consistently?

The cabin temp was no issue for me in ~6 transpacific flights in the last year.

Finally, you may want to consider ANA's "The Room" out of JFK. JAL like service with an enclosed seat is definitely an upgrade over the already top notch Skysuite on JAL and was cheaper than the equivalent on JAL.