US Carriers are against Norwegian Air International for a few reasons. One of the reasons being that they would be able to sneak by labor laws and safety rules. This could potentially cause an ample amount of issues here in the United States. Also, due to the fact that Norwegian Air International is licensed in different countries, it would be very hard to hold someone accountable since there would not be one place that could be held responsible.
The United States Department of Transportation recently rejected Norwegian Air International from flying routes to the United States on the basis of the complexity of the situation. The DOT only grants temporary access in clear cut cases, so they decided to reject the case temporarily until a permanent decision can be made. I personally believe this is the best decision at least maintaining the intercontinental routes we have here in the United States.
If Norwegian Air International is granted access in the United States I think this will be very detrimental to the United States air carriers. We should continue to protect our routes and only grant subsidies to international airlines. This way we can protect US companies and allow their business to grow while still maintaining competition.