(b)
Exceptions
This chapter does not extend antitrust immunity—
(1)
to any agreement with or among air carriers, rail carriers, motor carriers, or common carriers by water not subject to this chapter with respect to transportation within the United States;
(2)
to any discussion or agreement among common carriers that are subject to this chapter regarding the inland divisions (as opposed to the inland portions) of through rates within the United States;
(3)
to any agreement among common carriers subject to this chapter to establish, operate, or maintain a marine terminal in the United States; or
(4)
to any loyalty contract.