Credit Card Question, and Viewing PENDING Charges, they disappeared?

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I would look to NCL before Costco. I expect that NCL will want to hold onto an "Eight Pack" of customers if possible and, NCL might be "juggling" the charges. I'd try a "friendly" call to NCL and see what they say about your refunds. If you play it right, you might score a nice discount on a future cruise in addition to getting your full refund.