Why Carnival Corporation, Royal Caribbean, and Norwegian Cruise Line Stocks Jumped -- Then Slumped -- Wednesday

In the first few minutes of trading Wednesday, shares of Norwegian Cruise Line Holdings (NYSE: NCLH), Carnival Corporation (NYSE: CCL), and Royal Caribbean (NYSE: RCL) rushed forward in near lockstep, rising 11.3%, 11.5%, and 11.6% -- but the rally didn't last the hour. Seems investors can't make up their minds what's going on with the cruise industry today. Clearly cruise stocks are moving as a group, and not based on how investors weigh their individual merits -- which isn't surprising.