The US Centers for Disease Control and Prevention (CDC) has issued latest guidance for the US cruise sector, but Norwegian Cruise Line Holdings chief executive Frank Del Rio is not happy.

On Wednesday, the CDC issued Phases 2B and 3 of its Conditional Sail Order six months after unveiling the restrictions for cruiseships in US waters.

The newest recommendations provide measures for simulated voyages, but the CDC said a week earlier that owners may hold actual sailings as long as passengers and crew are vaccinated.