I'm not sure what you mean by this. To be US-flagged the ship must be primarily built in the US, owned by a US company, and primarily crewed by US citizens or permanent residents. That's why nearly all cruise ships serving US ports are foreign-flagged.
My comment was about changing the Passenger Vessel Services Act (PVSA) of 1886 (and that portion of the PVSA that carried into the Jones Act). Happycamper was talking about flagging/crewing/building requirements according to the Jones act. We were talking about two different things (or two different sections of the same law, I guess), so I was saying the other things don't apply to the solution I was proposing.
