https://www.americanexpress.com/?sharedid=14011810018&subid1=6c729e2cb98311efabd03a02402c27710INT Select American Express Cardholders: Spend $750 at Carnival Cruise Lines and Get $150 Statement Credit when you use your enrolled eligible card to make a single purchase Carnival Cruise purchase at the Carnival Cruise Lines website, by calling 1-800-764-7419, or through a Carnival Cruise Line travel advisor.