In 1963 , after the GBL retired the North American , the South American and the Greene Line 's Delta Queen were the last two long - distance cruise ships sailing under the U.S. flag .
The Georgian Bay Line lost money in the 1960s .
In 1963 , after the Georgian Bay Line retired the North American , the South American and the Greene Line 's Delta Queen were the last two long - distance cruise ships sailing under the U.S. flag .
The Georgian Bay Line lost money in the 1960s .