I have the Barclay Carnival Cruise Line card. I redeemed rewards for $400 on board credit on our January & February cruises and haven't used the card since. After 17 Carnival cruises, we've decided not to sail with them again, but have kept the account open, planning to transition it to JetBlue as soon as that becomes an option. At that point, I'll probably cancel my JetBlue Amex.