Ahoy there, matey! I think I spy a trend!

For four days running, shares of all the major American cruise line stocks have sailed higher and higher. With Norwegian Cruise Line Holdings (NYSE: NCLH) tacking on another 4.5% through 11:50 a.m. ET today, Carnival (NYSE: CCL) gaining 5.7%, and Royal Caribbean (NYSE: RCL) leading the pack higher with a 6.7% gain, cruise stocks are now up an average of more than 23% apiece over the last four trading days.

This is no coincidence.

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Source Fool.com