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https://www.aa.com/i18n/travel-info/special-assistance/special-assistance.jsp?anchorEvent=false&from=Nav#extraspa ce

Extra space during travel

For the safety and comfort of all customers, if a customer’s body extends more than 1 inch beyond the outermost edge of the armrest and a seat belt extension is needed, another seat is required. We encourage customers to address all seating needs when booking.

• When you call to book, Reservations will make sure you get 2 adjacent seats at the same rate.
• If you didn’t book an extra seat in advance, ask an airport agent to find out if 2 adjacent seats are available.
• You may be offered a seat in a higher class of service that may provide more space; in this case, you’ll be responsible for the fare difference.
• If accommodations can’t be made on your original flight, you can buy seats on a different flight at the same price as your original seats.