70 ILCS 1837/75
Upon the issue of any revenue bonds as provided in this Act, the Board shall fix and establish rates, charges, and fees for the use of facilities acquired, constructed, reconstructed, extended, or improved with the proceeds derived from the sale of those revenue bonds sufficient at all times with other revenues of the District, if any, to pay the following: (i) the cost of maintaining, repairing, regulating, and operating the facilities and (ii) the bonds and interest thereon as they become due, all sinking fund requirements, and other requirements provided by the ordinance authorizing the issuance of the bonds or as provided by any trust agreement executed to secure payment thereof.
To secure the payment of any or all revenue bonds and for the purpose of setting forth the covenants and undertaking of the District in connection with the issuance of revenue bonds and the issuance of any additional revenue bonds payable from the revenue income to be derived from the terminals, terminal facilities, airports, airfields, and port facilities, the District may execute and deliver a trust agreement or agreements except that no lien upon any physical property of the District shall be created thereby. A remedy for any breach or default of the terms of any such trust agreement by the District may be by mandamus proceedings in the circuit court to compel performance and compliance therewith, but the trust agreement may prescribe by whom or on whose behalf the action may be instituted.
70 ILCS 1837/75