The 8 classes of Carnival Cruise Line ships, explained Gene Sloan © Provided by The Points Guy MSN has partnered with The Points Guy for our coverage of credit card products. MSN and The Points Guy may receive a commission from card issuers. Thinking about a cruise on a Carnival Cruise Line ship? You’ve got a lot of options. Carnival operates 24 vessels, with one more scheduled to join its fleet in 2022. That’s more vessels than any other major cruise line except Royal Caribbean, which also has 24 vessels. In general, Carnival’s 24 ships are big ships. But with one ex...