In our case, leaving the ship in Barcelona in the morning for a 2pm flight back to the states. How would you handle getting the BP's printed? I'm concerned about not getting into the airport without the BP's. I'm guessing you'd just have them printed on the ship before leaving the night before?I haven't heard of any airports that require a boarding pass to get into the terminal building. The (relatively few) airports that require some printed documentary evidence of travel tend to be in non-Western countries where some airlines are simply not able to issue boarding passes except at the check-in desk. So a printed itinerary is usually fine to satisfy any requirement of this kind.
For Barcelona, as others have said this simply doesn't apply. In all the times I've flown from there, I've never checked-in in advance, let alone had a boarding pass. So I would simply go to the airport and check-in there. If I needed to check-in early to get seats, I'd do that but not print a boarding pass. For your trip, almost certainly it simply isn't necessary to have a boarding pass in hand in advance.
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