Norwegian UK has purchased 28 weekly slots from Lithuanian airline SmallPlanet.
Already the third largest airline at London Gatwick, it will make the airport the Norwegian groups largest operation.
It now has to decide where to use the slots rumoured to have cost some £40m.
Norwegian UK already has over 1000 pilots and cabin crew based at Gatwick, is about to launch routes to Chicago and Buenos Aries (Argentina). It started flights to Singapore from Gatwick earlier this year.
More long haul routes on top of its nine city network into the US seem inevitable, along with increased U.K. to Europe short haul where it often competes with easyJet or BA, both based at Gatwick.
British Airways recently purchased all of Monarchs old Gatwick slots.