The requirements would be they have to register in the US so should they fail to pay the loan, the government can take them over. Hard to seize a ship if it's not an American ship. Probably why they're raising money on their own. They don't want Carnival cruise lines to be renamed "Trump cruise lines" in a year.
Yeahh . . . . . also what they more likely fear more is that the ''name change '' could send them straight up to bankruptcy..
You can seize any vessel docked at a U.S. port..just go to Federal Court and get a lien and an attachment order.