Keflavik
The suggestion seems to be that because KEF didn't work for easyJet at BRS it wouldn't at NCL. I'm a bit surprised to hear that it didn't work at BRS.
The first two complete calendar years saw over 34,000 in 2014 and over 37,000 in 2015 at mainly 2 x weekly in summer and up to 3 x weekly in winter. Broadly the loads spread between 319 and 320 aircraft averaged out between 140 and 145 throughout the year in 2015. Of course we don't know yields.
As yeo valley points out easyJet is stopping the route next week (originally planned to stop in April) but will resume on 27 October at a mixture of 3 x weekly and 2 x weekly. Given that Wow is competing now and easyJet knew this when they decided to resume in October I wonder whether this shows that KEF might well stand a chance at NCL.