I would recommend you talk to a cruise oriented Travel agent that can explain the difference in these cruises. The foreign flagged ships do the 15 day cruises. NCL America does the 7 day. Their ships are registered in America and they have American crew not International crew. You will have a lot of sea days with the 15 day. A Travel agent can go into more detail with you based on your likes/dislikes, your expectations and needs.
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