Norwegian's flights are operated by itself as well as fully owned subsidiaries, including Norwegian Air International based in Ireland, Norwegian Air Sweden, and Norwegian Air Norway with former long-haul subsidiaries Norwegian Air UK and Norwegian Long Haul from Norway being put into liquidation. Each airline holds a unique air operator's certificate (AOC) but shares branding and commercial functions with the rest of the Group. Until December 2019, Norwegian also owned and operated Norwegian Air Argentina, which operated domestic flights within the country.