https://www.aa.com/i18n/utility/FAQs/AAdvantage_FAQ.jsp#Missing%20Mileage%
20Credit
Q: How long should I wait before I request my mileage credit?
A: You should wait a minimum of 15 days from the completion date of
your trip. For mileage credit transactions with other partners, allow a
minimum of 30 days from the transaction. Any request for mileage not
credited to your account must be requested within 12 months of the activity.
Activity prior to your enrollment date is not eligible for mileage credit.
