Ind. Code § 8-21-9-21
A special and distinct revolving fund is hereby created, to be known as the "Airport Fund." Expenditures from the fund shall be made only for the acquisition of land including lands under water and riparian rights, or options for the purchase of such land for an airport or airport facility site, and incidental expenses incurred in connection with such acquisition, for the preparation of plans and specifications for any part or all of the airport or airport facility, for studies in connection with the airport or airport facility, and for administrative expenses of the department. The fund shall be held in the name of the department, shall be administered by the department, and all expenditures therefrom shall be made by the department, subject, however, to the approval by the governor, the state budget agency, and the state budget committee of all expenditures of moneys advanced to the fund by the State of Indiana. Requests for such approval shall be made in such form as shall be prescribed by the budget agency, but expenditures for acquisition of land including lands under water and riparian rights, or options for the purchase of such land, shall be specifically requested and approved as to the land to be acquired and the amount to be expended. No transfers from said fund to any other fund of the state shall be made except pursuant to legislative action.
Upon the sale of airport revenue bonds for any airport facility or airport facilities, the funds expended from the "Airport Fund" in connection with the development of such airport facility or airport facilities and any obligation or expense incurred by the department for surveys, preparation of plans and specifications, and other engineering or other services in connection with development of such project shall be reimbursed to the "Airport Fund" from the proceeds of such bonds.
IC 8-21-9-21