I am hoping the Marriott Concierge can explain the detail behind why this happened.

We want to inform you of an important change to the Marriott Rewards® program. Effective July 1, 2010, the option to earn American Airlines AAdvantage® miles for stays with Marriott Rewards will no longer be available. The last day to earn AAdvantage miles on a qualified stay is June 30, 2010.

We apologize for the inconvenience and ask you visit your account profile, where you can opt to earn miles with any of our existing 30 airline program partners, or convert your earning preference to Marriott Rewards points. As a points earner, you'll have access to our current bonus promotion, offering up to 2 free nights plus up to $50 off a Hertz® car rental! Visit MarriottRewardsBonus.com to learn more and register today.

For complete program details, visit MarriottRewards.com, call 801-468-4000, or contact your local Guest Services office. We appreciate your loyalty to Marriott® and look forward to seeing you again soon.

Thank you,
The Marriott Rewards Team