Here is the main part of a snail mail letter I got this week:
Regarding Your AAdvantage Aviator Business Mastercard:
Dear sdsearch,
Due to a technical error, you did not receive the Anniversary Bonus on your AAdvantage Aviator Business Mastercard account.
We have now added your Anniversary Bonus to your account and it will be reflected on your statement within 1-2 billing cycles.
I presume they are referring to this:
5% AAdvantageŽ mileage bonus
earned every year after your account anniversary date based on the total number of miles earned using your card.