This part applies to releases from terms, conditions, reservations, or restrictions in any deed, surrender of leasehold, or other instrument of transfer or conveyance (in this part called ``instrument of disposal'') by which some right, title, or interest of the United States in real or personal property was conveyed to a non-Federal public agency under section 13 of the Surplus Property Act of 1944 (58 Stat. 765; 61 Stat. 678) to be used by that agency in developing, improving, operating, or maintaining a public airport or to provide a source of revenue from non-aviation business at a public airport.