OP - There are multiple connection options starting at roughly 10:30 through LAX, DFW, and CLT. All arrive prior to midnight. Have you walked through each option with AA?
What do the OA options cost. If you can find something at roughly the cost of what you have paid, you are entitled to cancel your AA ticket segment for a full refund to your original form of payment and then purchase whatever you want. This far out, it is entirely possible that there are options in the same range, albeit with a connection.