Yes, your wife can absolutely use your American Airlines AAdvantage miles, but the method you choose affects the cost. The most efficient way is for you to simply book the flight for her using your own account; when you reach the passenger information page, you just enter her name instead of yours. There is no extra fee for this, and it is perfectly legal under AA's 2026 terms. Alternatively, you can "Transfer" miles directly into her account, but this is a "poor value" move because American Airlines charges a fee (usually $0.005 per mile + a processing fee) to move them. For 2026 families, the best strategy is to keep the miles in the original account and book the "Award Ticket" directly for the intended traveler. Just remember that the miles will come from your balance, but she will be the one who earns no "Loyalty Points" for the trip since award flights don't count toward elite status for the passenger.