See
https://www.norwegian.com/us/ipr/ref...category=DELAY but Norwegian will probably not answer you, so you will need to escalate to US DoT which will force an answer, and then if you are not satisfied reach out to AirHelp (which might take up to 50%) of file a claim in small claims court. I have a small claims court hearing scheduled two weeks from now and I will report on how it goes...