US Airways had that requirement mostly because of all the issues they were having with long time FOs who were burnt out not being able to pass training events/upgrades. No idea if AA has it.

It's funny looking back but getting downgraded was the best thing that ever happened to me because it gave me another recent training event that put me through on their selection criteria. Meanwhile a lot of guys just senior to me who never got downgraded were still at my regional years later. Kinda funny how it all seems to work out.