I just called to sign up for the Platinum Challenge.

I was told that only points earned on flights operated by American will count towards the challenge.

I was told that this is a new policy effective January 1.

I called back to confirm and was told that if you are ticketed through American the points MAY count, even if the flight is operated by another AAdvantage carrier. (Sorry, but the rep. wasn't too clear on the change.)

Bottom line: Be careful if you're counting on points earned through flights on other AAdvantage carriers.