Compare Cruise-ship Vs. Flights
On flights, people sit shoulder to shoulder, and exhale air into a closed tube. Before the exhaled air flows out to a filter, it passes several people nearby. The mask borders are not airtight so air escapes around the mask. Even the mask material can not stop exhaled virus material since the virus size is extremely small and 99% of masks can not stop them from passing through.
On cruise ships, you have air space 10,000 bigger than volume of aircraft shell. And there is every opportunity for social distancing.
When people exit the aircraft, they are not tested for infection. All 300 people on a jumbo plane could be infected, but nobody will know about it. You will never see it on the news.
On a cruise ship, if one gets symptoms of covid, you are required to report to the medical staff on ship. The staff can then test all contacts with the infected person. If more than 2 or 3 are infected it becomes news.
On my cruise last September & November, every passenger was required to show certificate of full vaccination. And every passengers was required to get a negative test for covid within 48 hours of sailing. But the passenger could get infected on the flight to the cruise terminal city, and no one would know about it.
But CDC is singling out cruise industry, and airlines are not being restricted.
How about the restaurant industry? That is even more risky for passing infections than airlines. Because no one is asked of any proof of negative covid test before being served. At least you have to show a negative test result before boarding the aircraft.
DEMOCRATS (BUREAUCRATS....same thing) DESPISE the Cruise Industry because people are having FUN!!! DEMOCRATS HATE CLEAN FUN!
The cruise industry is simply not bribing the right politicians. Foreign registry may also be a factor.