Norwegian Cruise Line does a stellar job of informing its guests about potential changes. Dubbed the "cleanest cruise line" by the CDC , NCL has issued several warnings to its cruisers over the last couple of months, including an advisory on potential phone scams that could cost guests nearly $20,000 .

The cruise line is now issuing another warning. This one is specifically for American passengers taking on cruises to destinations like Canada. There is confusion regarding the U.S. Passport card. It is valid for ground travel to Canada, but the same doesn't hold for air travel.

Norwegian Cruise Line has provided some clarity to its guests, especially those who tend to carry a passport card and may consider leaving their passport book at home.

Here's what NCL said, and how cruisers ar

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