A cruise liner need not remove architectural barriers if such removal would promote a possible threat to the safety of others, if such removal and restructuring of barriers would put the ship in noncompliance with international laws regarding safety at sea, and if such barrier removal would "interfere with the internal governing policies of the ship." Almost all cruise ships sailing round trips from American seaports are registered in other countries. Most of the cruise lines, even those with a principal place of business in the United States, have their corporation registered in another country. Norwegian Cruise Lines is incorporated in Bermuda, has its principal place of business in Miami, and the two ships in question in this case are registered in the Bahamas. This case was filed by a group of disabled persons who attempted to sail two different Norwegian Cruise Lines ships sailing out of Houston, Texas.