Norwegian's Chief Executive, BjØrn Kjos, said they may have to push back NAS 2.14 % its May, 2016 scheduled service, on its subsidiary airline, from Cork, Ireland to Boston all the way to next year because they don't have the US's approval for those flights still.
Norwegian Air Shuttle has been limited to flying direct from Scandinavia to the US. They set up a EU subsidiary in Ireland that will allow them to fly to London and other cities. They have been held up though getting a foreign carrier permit by the US Department of Transportation . What usually takes 30 days has taken over two years. The permit is being opposed by some US Airlines and unions.