Originally Posted by PrincessShmoo
The rule is "a foreign-flagged ship cannot transport a passenger from one US port to a different US port without a stop in a distant foreign port. A distant foreign port is defined as any port not in the Caribbean, or North America".
The law for closed loop cruises (beginning and ending in the same US port) is that they must stop at any foreign port (near or distant).
It's called the Passenger Vessel Services Act (PVSA).
Thank you, Shmoo, for explaining that much better than I ever could. I'm now wondering, though, how does a "cruise to nowhere" fit into the PVSA?