From AA current T&Cs: "A $100 USD change fee (subject to change without notice) will apply for any confrimed change to a PlanAAhead award ticket. Exception: Premium cabin PlanAAhead tickets for which the only confirmed change is to the date and/or time will not incur the change fee."

Let's just let everybody interpret this as they see fit. To me (and to the AA agents I have talked to) it is crystal clear. ONLY date and time changes will not incur the fee.

Maybe others read it differently.