620 ILCS 45/11
Any such county which has voted, or hereafter votes to authorize a tax for an airport and landing field at a rate in addition to the maximum rate now or hereafter authorized to be levied and extended for general county purposes, may issue bonds as in this Act provided in an amount not to exceed one percent (1%) on the dollar valuation of all taxable property of such county for the purpose of constructing or improving an airport and landing field within the county; Provided, that such bonds may not be issued to an amount, including existing indebtedness, in excess of the constitutional limit of indebtedness.
In the event that any taxing body has voted, under the provisions of this Act, to authorize a tax for the joint operation of an airport and landing field with other taxing bodies at a rate now or hereafter authorized to be levied and extended for general corporate purposes, it may issue bonds for its proportionate share as in this Act provided in an amount not to exceed one percent (1%) on the dollar valuation of all taxable property of such taxing district for the purpose of participating jointly in constructing or improving an airport and landing field; Provided, that such bonds may not be issued to an amount, including existing indebtedness, above the constitutional limit of indebtedness of such taxing district.
620 ILCS 45/11