((a)) ** .—** Except as provided in subsection (b), an American Great Lakes vessel may not be used to—

((1)) engage in trade—

((A)) from a port in the United States that is not located on the Great Lakes; or

((B)) between ports in the United States;

((2)) transport bulk cargo (as defined in ) that is subject to section 55305 or 55314 of this title or ; or

((3)) provide a service (except ocean freight service) as—

((A)) a contract carrier; or

((B)) a common carrier on a fixed advertised schedule offering frequent sailings at regular intervals in the foreign trade of the United States.

((b)) ** .—** An American Great Lakes vessel may be used for not more than 90 days during any 12-month period to engage in trade prohibited by subsection (a)(1)(A), except during the Great Lakes shipping season.