(1) Notwithstanding other provisions of this chapter, tax imposed with respect to the sale, the use, the consumption, the distribution and the storage of aviation fuel that is actually used in the operation of airplane or aircraft motors, shall be at the rate of four and one-half percent (4.5%).
(2) The tax imposed and remitted on a person's purchase, use, consumption, or storage of aviation fuel pursuant to subsection (a) shall not exceed the following: Twenty-one million three hundred seventy-five thousand dollars ($21,375,000) for the period of July 1, 2015 through June 30, 2016;
(3) Seventeen million seven hundred fifty thousand dollars ($17,750,000) for the period of July 1, 2016 through June 30, 2017;
(4) Fourteen million one hundred twenty-five thousand dollars ($14,125,000) for the period of July 1, 2017 through June 30, 2018; and
(5) Ten million five hundred thousand dollars ($10,500,000) for any tax year occurring on or after July 1, 2018.
(6) For purposes of this subsection (b), “tax year” means a period beginning on July 1 and ending on the following June 30. The commissioner shall establish a process for applying the cap provided by subdivision (b)(1).