(a) The governing body of a local government may impose an annual property tax not to exceed five cents on each $100 valuation to improve, operate, and maintain an airport or air navigation facility or for any other purpose authorized by this chapter.
(b) The tax authorized by Subsection (a) is in addition to other taxes that may be imposed for the interest and sinking fund of bonds, notes, or time warrants issued under authority of this chapter or any other statute authorizing a local government to issue bonds, notes, or warrants for airport purposes.