Norwegian Air International

In February 2014, Norwegian Air International received its operating licence and air operator's certificate issued by Ireland. Its flights were operated under its own IATA and ICAO airline codes, using its own fleet registered in Ireland. The airline shared the same branding with its parent Norwegian Air Shuttle and integrated subsidiaries as Norwegian Group airlines. Its registration within Ireland and outside Norway allowed the company to take advantage of European Union airline freedoms and agreements.

In February 2017, Norwegian Air International announced it would start transatlantic flights to the United States from the United Kingdom and Ireland in summer 2017 on behalf of its parent company, using the parent's new Boeing 737 MAX aircraft expected to be delivered from May 2017.

Norwegian Air International performed its first transatlantic flight with a Boeing 737-800 on 16 June 2017 between Edinburgh Airport and Stewart International Airport in Newburgh, New York. The first transatlantic flight with a 737 MAX was performed on 15 July 2017, with a MAX 8 featuring Sir Freddie Laker on its tailfin, between Edinburgh Airport in Scotland and Bradley International Airport serving Hartford, Connecticut, followed by a second daily rotation from Edinburgh to Stewart International Airport. Additional transatlantic flights using Boeing 737 aircraft were launched between destinations including Belfast, Bergen, Cork, Dublin, and Shannon in Europe to Hamilton, Hartford, Newburgh, and Providence in North America, however all transatlantic flights using the Boeing 737 were subsequently discontinued by 15 September 2019. On 11 May 2018, its US Department of Transportation approval was maintained by a judicial panel after being challenged by four unions representing 135,000 airline workers.

In March 2021, parent company Norwegian Air Shuttle's CFO Geir Karlsen reported that its Boeing 737 MAX fleet, some examples of which were registered to Norwegian Air International, would not resume operations and that the fleet would be retired. By April 2021, the remainder of its fleet was either returned to lessors or transferred to Norwegian Air Shuttle or Norwegian Air Sweden, while the flight operations and bases it maintained on behalf of the Norwegian Group were transferred to Norwegian Air Sweden. This allowed its parent company to further consolidate its structure of AOCs, by retiring its Irish AOC and maintaining its Swedish AOC for operations outside of Norway but within the rest of the EU.