(a) The Governor may place steam and motorships under foreign flag, engaged in regular and constant trade between the islands of the Virgin Islands, U.S.A., on even footing in respect of ship dues, under this subchapter, with steamers under the United States flag, engaged in the same trade.
(b) The Governor may apply the reduction of ship dues, under this subchapter, for goods transshipped directly from ship to ship, also on goods which, either in the bill of lading or in the general entry, are specified as destined directly to another place than the Virgin Islands, although such goods are not transshipped directly from vessel to vessel but are temporarily stored in the warehouse of a steamship company or wharf owner, provided the warehousing takes place in such a manner as to give security against abuse.
(c) The Governor may allow the reduction of ship dues, under this subchapter, on goods transshipped direct from ship to ship to be applied also to goods which are warehoused under the supervision of the Collector of Customs in private warehouses temporarily and are destined for export, with the restriction that ship dues must be paid in full if the goods have not been exported within two years of the importation. The Governor may, however, on timely applications grant extensions of the time of export not exceeding one year each time.
(d) The Governor may grant any vessel contracted for mail service between St. Croix and St. Thomas exemption from payment of ship dues in St. Thomas harbor on cargo carried on regular mail trips.