For the second day in a row, cruise line stocks are full speed ahead and racing for the open sea. Yesterday, a better-than-expected revenue report out of Royal Caribbean (NYSE: RCL) sparked a rally across the cruise line sector. The momentum is carrying into this afternoon, with Royal Caribbean shares gaining another 4.3% through 12:15 p.m. EDT, Carnival Corporation (NYSE: CCL) lagging just a bit with a 3.6% gain, and Norwegian Cruise Line Holdings (NYSE: NCLH) up a solid 6%.