For a limited time, earn 2,500 American Airlines AAdvantage bonus miles after you add an authorized user and you or your authorized user spends $3,500 on purchases between 7/1/2017 and 9/30/2017.
To add an authorized user, you can log in here. You’ll need your Authorized User’s name, birth date and address.
I don’t see any language to indicate that this is a targeted offer, but it could be. Regardless, this offer requires lot’s of spending for just 2,500 AA miles. It doesn’t even add up to one extra mile per dollar.