Not as an AA carrier. We do not have J/C ZED agreements with other carriers so we can not even buy a business class ZED - only Y. Other carriers have ZED agreements with other airlines that allow F/J/C ZED tickets. I think if a carrier has W ("Main Cabin Extra" type or "Premium Economy") you can be put in there with a Y inventory listing.

Otherwise a Y listing ZED you can only sit in Y - even if J/C is open.