 Shares of cruise line stocks had another strong start to the day Wednesday after one cruise line returned to open water and another found ways to sell high-value cruise tickets. Shares of Norwegian Cruise Line Holdings NYSE: NCLH rose as much as 7.7 in early trading and were still up 3.3 at 3 p.m. EDT today. Shares of Carnival NYSE: CCL were up 5.3 early and 1.8 higher at 3 p.m. And Royal Caribbean NYSE: RCL was up 6.2, and 2.1 later in the day. 