Certainly for tickets originally issued after 15 August 2005 according to this earlier discussion, and possibly for all reissues after that date (although I would have thought they would remain bound by the original contract for earlier tickets).
http://www.flyertalk.com/forum/showp...20&postcount=4

Within the last week I was only charged US$75 by AA for a reissue of a ticket last reissued in July.