To acquire, own, construct, lease and maintain airport and water terminal facilities and transportation facilities within the Port District, and, subject to the provisions of Section 7 of this Act, to operate or contract for the operation of such facilities, and to fix and collect just, reasonable and nondiscriminatory charges or rentals for the use of such facilities. The charges or rentals so collected shall be deposited in the treasury of the Port District, and be used to defray the reasonable expenses of the Port District, and to pay the principal and interest upon any revenue bonds issued by the Port District.
70 ILCS 1815/6.10