Norwegian Cruise Line began in 1966 as Norwegian Caribbean Lines, founded by Norwegian shipowner Knut Kloster with Ted Arison, and built its name on Caribbean cruising out of Miami with the converted ferry Sunward. Arison soon left to found Carnival, while Kloster's line pioneered several industry habits, from private-island calls to turning the liner France into the cruise ship Norway. Norwegian later became known for a deliberately informal, flexible style of cruising, without fixed dining times or formal dress expectations. The fleet below is entirely mainstream in character and tightly grouped in size: the oldest ships, Norwegian Sky, Norwegian Spirit and Norwegian Sun, sit between about 76,000 and 78,000 GT, the Jewel class holds the middle at roughly 93,500 GT, and the Breakaway and Breakaway Plus ships reach about 169,000 GT. The newer Prima class is slightly smaller by tonnage but more spacious in feel, and Pride of America stands apart as the fleet's US-flagged ship.
The fleet — 21 ships in this directory
Sources: https://en.wikipedia.org/wiki/Norwegian_Cruise_Line, https://www.travelweekly.com/Cruise-Travel/From-Transportation-to-Destination