Allure of the seas is the biggest passenger ship with a massive 225,282tons and 1,181ft in length...
(http://upload.wikimedia.org/wikipedia/commons/thumb/e/e1/Allure_of_the_seas_sideview.JPG/800px-Allure_of_the_seas_sideview.JPG)
So what cruise line will be the first to surpass the 225,282ton Allure, maybe not anytime soon but the day will come. Royal Caribbean International could build bigger but there rival lines like Carnival Line, Disney Cruise Line may surprise them.
So what ship line will be the first to create a ship bigger than Allure?