620 ILCS 40/14
A statutory mortgage lien exists upon the airport or landing field and the facilities and appurtenances thereof acquired by or constructed from the proceeds of the revenue bonds authorized to be issued under Section 10 of this Act. This lien shall exist in favor of the holders of these bonds, and each of them, and in favor of the holders of the coupons attached to these bonds. The airport or landing field and the facilities and appurtenances thereof shall remain subject to this statutory mortgage lien until payment in full of the principal and interest of these revenue bonds. Any holder of a bond issued under Section 10 of this Act or of any coupon representing interest accrued thereon, may, in any civil action, enforce the statutory mortgage lien created by this Section and may, by proper suit, compel the performance of the duties of the officials of the issuing county set forth in this Act.
If there is a default in the payment of the principal of or interest upon any of these bonds, the circuit court may appoint a receiver to administer the airport or landing field and the facilities and appurtenances thereof on behalf of the county with power to charge and collect fees sufficient to provide for the payment of the operating expenses and for the payment of these bonds and interest thereon and to apply the income and revenue in conformity with this Act and the resolution providing for the issuance of these bonds.
620 ILCS 40/14