Thanks for replies.
Yes I know they are flying to USA destinations but didn't think the time I saw aircraft matched any arrivals.
Didn't know they flew 787 within Europe though.
As an aside I have heard two people this week voicing concerns that they have package holiday flights booked and discover it is Norwegian!
I don't think Norwegian have got their message across yet. One conversation I over heard in a Supermarket , I think, didn't even know where Norway is I think they thought it was some dodgy place in the former Soviet Union!
The other was a relative who is a seasoned traveller but thought it strange that she was travelling to Ibiza from Gatwick on a Norwegian airline.
They might need a bit more informative advertising.