After reading this yesterday, I went to the AA site to read the fine print vis a vis the changed relationship with CP. They note that CP will be leaving oneworld on June 1st, but otherwise everything else about FF program reciprocity remains in place. (No reference to lounge access, however.) Qualifying miles can be earned on AAdvantage for all CP flights (not just codeshares) and redemptions appear to be as before. Such remains the case with CP from everything I've read. Even upgrades are useable on the other airline for all NAmerican flights (not just codeshares) albeit under the revised eligible fare categories for CP (rather than "any fare" as in past). They now advise getting paper copies of AAdvantage upgrades in advance if using them on CP flights. (Can only be used on regular CP flights, not AC-operate ones.)

Still puzzled about the ineligibility of JFK-SFO/LAX non-stops as there is no restriction noted in AAdvantage redemption rules for these flights, why would there be for CP? RichLord, have you since tried calling another agent and making booking?