It's possible I'm misunderstanding you, but outside of operational upgrades in oversold situations, AA doesn't have any complimentary upgrade from J to F. You can use one of your system-wide upgrades (SWUs) on both international and Flagship transcontinental routes to go from J to F. On domestic routes, you'll also enjoy unlimited auto-requested complimentary upgrades from from Y to the next-highest cabin on a space-available basis.