Don't think you mean the "Jones Act", but, the PVSA (Passenger Vessel Services Act, https://en.wikipedia.org/wiki/Passenger_Vessel_Services_Act_of_1886 .
PVSA also restricts coastwise transportation of passengers and 46 USC section 12108 restricts the use of foreign vessel to commercially catch or transport fish in U.S. waters. These provisions also require at least three-fourths of the crewmembers to be U.S. citizens. Moreover, the steel of foreign repair work on the hull and superstructure of a U.S.-flagged vessel is limited to ten percent by weight.
The PSVA has had an interesting consequence with regard to the cruise ship industry within the state of Hawaii. Foreign-flagged cruise ships may carry passengers between ports in the Hawaiian Islands as long as no passenger permanently leaves the vessel at ports other than the origination port and the vessel makes at least one call at a foreign port. Norwegian Cruise Line created a subsidiary, NCL America, and introduced three new US-flagged vessels: Pride of Aloha in 2004, Pride of America in 2005, and Pride of Hawaii in 2006. Previously, with its foreign-flagged vessels, NCL needed to include a four-day detour to Tabuaeran (Fanning Atoll) in the Line Islands (Republic of Kiribati) on its Hawaiian itineraries.
Reportedly due to financial losses, in 2007 NCL renamed Pride of Hawaii to Norwegian Jade, and reflagged and relocated the ship to Europe. In 2008, NCL also relocated Pride of Aloha to Florida, reflagging it and renaming it to Norwegian Sky at the same time. Thus the Pride of America is the sole NCL ship currently in Hawaii service.
The Jones Act has to do with cargo, or, cabotage------ https://en.wikipedia.org/wiki/Merchant_Marine_Act_of_1920. It is a United States federal statute that provides for the promotion and maintenance of the American merchant marine. Among other purposes, the law regulates maritime commerce in U.S. waters and between U.S. ports. Section 27 of the Jones Act deals with cabotage and requires that all goods transported by water between U.S. ports be carried on US flag ships, constructed in the United States, owned by U.S. citizens, and crewed by U.S. citizens and U.S. permanent residents Cabotage is the transport of goods or passengers between two points in the same country, alongside coastal waters, by a vessel or an aircraft registered in another country. Originally a shipping term, cabotage now also covers aviation, railways, and road transport. Cabotage is "trade or navigation in coastal waters, or the exclusive right of a country to operate the air traffic within its territory". In the context of "cabotage rights", cabotage refers to the right of a company from one country to trade in another country. In aviation terms, for example, it is the right to operate within the domestic borders of another country. Most countries enact cabotage laws for reasons of economic protectionism or national security.
The Jones Act prevents foreign-flagged ships from carrying cargo between the US mainland and noncontiguous parts of the US, such as Puerto Rico, Hawaii, Alaska, and Guam. Foreign ships inbound with goods cannot stop any of these four locations, offload goods, load mainland-bound goods, and continue to US mainland ports. Instead, they must proceed directly to US mainland ports, where distributors break bulk and then send goods to US places off the mainland by US-flagged ships. Jones Act restrictions can be circumvented by making a stop in a foreign country between two US ports, e.g., Anchorage–Vancouver–Seattle.