I suppose one would not be able to see where they offer instant upgrade without having an AAirpass since the fare buckets are used for revenue fares as well.
I would press the sales folks to declare yay or nay on the specific routes you are interested in flying, though it would be no guarantee they remain offered over time. This morning, I checked a few INTL routes and did not see any. I don't know if they still offer on some or not.
Whether or not you will save any money with AAirpass would require more analysis. I really only use it when I need flexibility
OK, I will call them for more info. Upgrade availability certainly will determine the value to both me and my company.