Costco Travel always recommends that you have your passport with you anytime you book international travel to ensure that your name, date of birth, and expiration date are entered accurately. (Fees may apply for corrections to your reservation.)
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You can go to the Airline's website to “manage my reservation”, and update your passport information there. If you have a problem you can call the airline, or contact them through social media.
Your passport number may, however, be needed at the time of online check-in. Please note that if you are travelling to, from or via the United States, you need to give advance passenger information (passport details and the full address of your first night's accommodation in the US).
First and foremost, if a United States citizen chooses to do a closed-loop cruise without a passport, they'll still be required to show a government-issued photo ID (such as a driver's license) and proof of citizenship (a certified copy of your birth certificate).
Immigration officials will often come onboard cruise ships to check documentation and the process of keeping the passports centrally makes it much easier and faster for the cruise line and passengers.
The airline representative will ask you for your passport at the time of checking in your baggage at their airport counter. You can also add your passport information on line by reviewing your travel ticket by opening it with your ticket confirmation number on your travel airline website.