Not any more. There used to be 1-2 day cruises to nowhere, booze cruises…but CBP ruled that on that type of voyage the crew were actually working in/from the US and would need a different (harder to get) visa. So the CTN went away. I think at least ten years ago. That said, you can find long cruises without intermediate ports. Not on the mass market lines, and not closed loop. The Cunard crossings are such. We were booked on one on Windstar from Costa Rica to Tahiti, 15 days. But Covid cancelled it. I have seen cruises on other smaller lines from Colon, Panama to the US East coast with no stops. They are out there, but not for the budget cruiser. EM