Cruise News Briefing - May 26, 2021 - AM UPDATE. Norwegian Cruise Line has announced the restart dates and regions for eight more of its cruise ships. Carnival Cruise Line has revealed details on the health and safety protocols that will be in place aboard Carnival Miracle for her cruises to Alaska this summer. Puerto Rico has announced that it will no longer require fully-vaccinated American travelers to provide a negative COVID-19 test to visit. Cruise line stocks for CCL, RCL, and NCLH.