You can use the Voucher but you have to call, from AAVacation FAQ
Can I use American Airlines travel vouchers to purchase a vacation package?
Yes, travel vouchers can be used toward the American Airlines and American Eagle flight portion of your trip, but may not be used to purchase any of the non-flight components of your trip such as hotels, rental cars, transfers, activities or insurance. Travel vouchers are not currently accepted online, but may be redeemed by calling us at 1-800-489-4810.
Call them and let us know.