Royal Caribbean has been offering short cruises on its massive Oasis-class ships for some time, first on Allure of the Seas. It even launched a brand-new ship (Utopia of the Seas) directly into short sailings last year, and is set to start offering 3- and 4-night cruises on its popular Wonder of the Seas in the Fall.

Carnival’s Conquest class ship could accommodate 1,000 more passengers than the current ship operating out of Baltimore’s port, the cruise line said.