The NEXT programme of improvements will include upgrades to dining facilities, enhanced entertainment and guest activities, and innovations in technology, it says.

NCL plans to revitalize vessels over this year and 2015 including the Norwegian Jewel, which just re-entered service following dry dock, and Norwegian Pearl, Norwegian Sky and Norwegian Spirit, which were also recently refurbished.

"The youngest fleet at sea continues to get even better," said Kevin Sheehan, NCL’s chief executive.

"We