World’s largest cruise ship Allure of the Seas to offer Oasis-class cruises in Europe The Montrealer February 19, 2014 11454 Rhapsody of the Seas and Splendour of the Seas to Join Allure of the Seas to offer Europe Vacations MIAMI: For nearly five years, Oasis of the Seas and Allure of the Seas, sister ships that share the title of ...