This is going to be a hard sell for Feel Air, the Norwegian market after all is not all that large, even if they have withstood the economic difficulties better than most and people have significant disposable income.
Like Norwegians Manager points out, you need feed into this kind of operation from a geographically large country like Norway. Likewise, especially in the US, you need interline connections to disperse the passengers where they really want to go. Maybe they are working on such things, but that complicates the LOCO model.
Letīs not forget that the largest carrier flying Norwegians to the US is...KLM, which have worked hard to get the Norwegian into their network via Amsterdam, providing (nearly) worldwide connections. Another player is Icelandair which has announced plans to increase their presence in the Norwegian market (SVG, BGO, TRD) to feed their hub in Reykjavik.
So, success for this kind of a startup is anything but given.