As soon as possible after the end of each fiscal year, the Director of Revenue shall order transferred and the State Treasurer and State Comptroller shall transfer from the Aviation Fuel Sales Tax Refund Fund to the State Aviation Program Fund 20% of any surplus remaining as of the end of such fiscal year and shall transfer from the Aviation Fuel Sales Tax Refund Fund to the General Revenue Fund 80% of any surplus remaining as of the end of such fiscal year.
This Section shall constitute an irrevocable and continuing appropriation from the Aviation Fuel Sales Tax Refund Fund for the purpose of paying refunds in accordance with the provisions of this Section.
30 ILCS 105/6z-20.3