Travel ‘Violated protocols’: Cruiser on Carnival Corp. ship blocked from boarding over COVID-19 rules October 22, 2020 Morgan Hines, USA TODAY Comments Off on ‘Violated protocols’: Cruiser on Carnival Corp. ship blocked from boarding over COVID-19 rules A passenger traveling on AIDA Cruises' AIDAblu was not allowed to reembark after disobeying cruise line protocol on an excursion.