All moneys received for airport purposes with the exception of moneys the title to which rests in the county airport commission in accordance with Section 63, shall be deposited in the treasury of said county to the credit of the designated fund and the Commission shall have exclusive control over its expenditure and it shall not be used for any other purposes than in this Act provided, and shall be drawn upon by the proper officers of the county upon properly authenticated vouchers of the Commission.
620 ILCS 50/49