N.C. Gen. Stat. § 160A-648
In addition to the powers here and before granted, the Authority shall have continuing power to purchase equipment, and in connection therewith execute agreements, leases with or without option to purchase, or equipment trust certificates. All money required to be paid by the Authority under the provisions of such agreements, leases with or without option to purchase, and equipment trust certificates shall be payable solely from the fares, fees, rentals, charges, revenues, and earnings of the Authority, monies derived from the sale of any surplus property of the Authority and gifts, grants, and contributions from any source whatever. Payment for such equipment or rentals therefore, may be made in installments; the deferred installments may be evidenced by equipment trust certificates payable solely from the aforesaid revenues or receipts, and title to such equipment may or may not vest in the Authority until the equipment trust certificates are paid.
N.C. Gen. Stat. § 160A-648