If you have flights booked through the cruise line, it may affect that. We used the NCL BOGO flights, and they specifically asked for our full names. And they gave them to Air Canada our outgoing flights that got us to London, but for some reason did not give them to Iceland Air for our return flight from Reykjavik. We were not able to use the airline kiosk to check in because they were missing our middle names. That is what was pointed out to us when it did not work, my DW's missing middle name. (Actually, it accepted mine without the middle name, and the airline person had no idea why that worked for me.)