I just received an email from Citi with a nice offer on one of my AAdvantage Platinum cards. Now, for a limited time, add an authorized user and spend $1,000 in purchases to receive 5,000 American Airlines AAdvantage® bonus miles by 06/30/2016. You’ll earn miles for their purchases, so your rewards add up even faster. I currently have 2 Citi AAdvantage Platinum cards after taking advantage of multiple 50k mile signup offers. My wife is already an authorized user on one. I received the offer on my most recent card, where I’m the only cardholder. According to the email, here’s all I need to do: Add an authorized user to your…