Marysunshine Yes, BA is a member of the oneworld alliance of which AA is also a member. You may use your BA miles on any AA flight except for transatlantic legs.
Also, since you asked, the best place to post this type of thing in the future would prolly be the AA forum, but don't worry (I get confused too since there are so many fora).
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I Love New York -- Viva Espaņa