(a) Except as provided by Subsection (b), the revenue from a tax imposed under this chapter by a county that has no municipality may be used only for:
(1) the purposes provided by Sections 351.101(a)(1), (2), and (4);
(2) advertising for general promotional and tourist advertising of the county and conducting a solicitation program to attract conventions and visitors either by the county or through contracts with persons or organizations selected by the commissioners court; and
(3) historical preservation and restoration.
(b) Notwithstanding any other provision of this chapter, a county described by Subsection (a) that owns an airport may use revenue from a tax imposed under this chapter for repairs and improvements to the county airport or reimbursement for repairs and improvements to the airport.

(c) A county to which Subsection (b) applies may not use revenue from a tax imposed under this chapter for a purpose described by Subsection (b) in a total amount that would exceed the amount of hotel revenue in the county that is likely to be reasonably attributable to guests traveling through the airport during the 15-year period beginning on the date the county first uses the tax revenue for that purpose.
(d) A county to which Subsection (b) applies may not use revenue from a tax imposed under this chapter for a purpose described by Subsection (b) after the 10th anniversary of the date the county first uses that revenue for that purpose.