Ala. Code § 4-4-11
Each municipality in this state shall have full and continuing power and authority, within the limits of the constitution now or hereafter in effect, to issue and sell bonds for the purpose of extending, enlarging and improving its airport or airports or an airport in which it is or may be a joint owner or operator and of acquiring or improving or paying for land for airport uses, or property purchased or condemned to facilitate the operation of an airport or airports, when the issuance of such bonds has been heretofore or shall be hereafter authorized by a majority vote of the qualified electors of such municipality voting at an election called and held, and the result declared, in the manner required by law for securing authorization for the issuance by such municipality of other bonds requiring authorization through or by means of an election.
Ala. Code § 4-4-11 (1975)