Sorry but this is incorrect
With its global corporate headquarters in Miami and several regional headquarters around the world, Carnival Corporation’s stock is dually listed on both the New York Stock Exchange and London Stock Exchange under the symbol CCL, and is the only group in the world to be included in both the S&P 500 and the FTSE 250 indices
https://www.carnivalcorp.com/corporate-information
The symbol CCL is used for both shares in New York known as Carnival Corp and in London as Carnival PLC.
You need to buy the Carnival PLC shares
Brian