Ala. Code § 4-3-51
The authority shall have the power and is hereby authorized at any time and from time to time to issue and sell its interest-bearing revenue bonds for any of its corporate purposes. The principal of and the interest on all such bonds shall be payable solely from, and may be secured by a pledge of, the revenues derived by the authority from the operation of any or all of its airports, heliports, facilities and other property. None of the bonds issued or contracts entered into by the authority shall ever constitute or create an obligation or debt of the state or of any county or municipality within the state, or a charge against the credit or taxing powers of the state or of any county or municipality within the state. Bonds of the authority may be issued at any time and from time to time, may be in such form and denominations, may be of such tenor, may be payable in such installments and at such time or times, not exceeding 40 years from their date, may be payable at such place or places whether within or without the state and may bear interest at such rate or rates, whether exceeding the rates proscribed by any law as usurious or not, payable and evidenced in such manner as shall not be inconsistent with the provisions of this article and as may be provided in the proceedings of the board wherein the bonds shall be authorized to be issued. Any bond having a stated maturity more than 10 years after its date shall be made subject to redemption at the option of the authority not later than the expiration of 10 years from its date and on any interest payment date thereafter at such price or prices and after such notice or notices and on such terms and in such manner as may be provided in the proceedings of the board wherein it is authorized to be issued. Bonds of the authority may be sold at public or private sale in such manner and from time to time as may be determined by the board. The authority may pay all reasonable expenses, premiums, fees and commissions that the board may deem necessary or advantageous in connection with the authorization, sale and issuance of its bonds. All bonds shall contain a recital that they are issued pursuant to the provisions of this article, which recital shall be conclusive that they have been duly authorized pursuant to the provisions of this article. Neither a public hearing nor consent of the State Department of Finance shall be prerequisite to the issuance of bonds by any authority. Notwithstanding the fact that they are payable solely from a specified source, all bonds issued under the provisions of this article shall be deemed negotiable instruments within the meaning of the negotiable instruments law of the state if they otherwise possess all the characteristics of negotiable instruments under the laws of the state.
Ala. Code § 4-3-51 (1975)