Ala. Code § 33-10-24
The commission is granted the power to incur debt and issue bonds by any of the means authorized by the Constitution and laws of the State of Alabama. Any revenue-producing wharf, dock, warehouse, elevator, industrial facility or other structure owned by or to be acquired by the commission from proceeds of bonds issued by it is hereby declared to be a revenue-producing public utility as that term is used and defined by the Constitution and laws of the state in connection with the issuance of revenue bonds of political subdivisions of the state. As an additional grant of authority beyond other provisions of the Constitution, the commission is authorized to issue negotiable bonds for any purpose within their delegated authority, and to pledge for the payment of the principal and interest of such negotiable bonds the income and revenues derived or to be derived from the properties and facilities maintained and operated by them or received by the commission from other sources. Such negotiable bonds may be further secured by a conventional mortgage upon any or all of the property constructed or acquired, or to be constructed or acquired by them. To further secure such negotiable bonds the commission may apply in whole or in part any money received by gift, grant, donation or otherwise from the United States, the State of Alabama, or any political subdivision thereof, unless otherwise provided by terms of the gift, devise, donation or similar grant.
Ala. Code § 33-10-24 (1975)