The operation of sections
of this Appendix shall terminate 90 days after the date on which a notification is made pursuant to section
of this Appendix, except with respect to shipments of agricultural commodities and products subject to contracts entered into before the expiration of such 90-day period, unless within such 90-day period the Secretary of Transportation proclaims that funds are available to finance increased freight charges resulting from the requirements of sections
and (b) of this Appendix. In the event of termination under this section, nothing in sections
of this Appendix shall be construed as exempting export activities from or subjecting export activities to the cargo preference laws except to the extent those activities are exempt under section
. In the event of termination under this section, the 50 percent requirement in section
of this Appendix shall be in full effect.