Upvote:4
Norwegian is a super discount airline, that does not have any partner alliances or codeshares. So I have a feeling these are separate tickets.
That's the bad thing. You need to consult with whoever sells those tickets if they offer some sort of connection insurance. But without something like that, Norwegian is simply not responsible for the knock-on effects of a mildly late arrival.
Delta owes you nothing if you miss the flight. You didn't show up, and there's no way to make this Norwegian's fault. Norwegian doesn't owe you any money for knock-on effects of a (mildly) late arrival. That's the difference between thru-ticketing and separate ticketing.
You can throw yourself on Delta's mercy; sometimes airlines have "flat tire" rules e.g. if you miss a flight through no fault of your own. However, this kinda would be your fault, booking such a very tight connection.