Their argument seems to be roughly akin to a claim on the common law's implicit warranty of merchantability. You could also think of it as a "lemon law" claim,

Their argument seems to be roughly akin to a claim on the common law's implicit warranty of merchantability. You could also think of it as a "lemon law" claim, maybe. It'll be interesting to see how that plays out, for Boeing as well as for Norwegian. I doubt they're the only airline that's been considering this kind of action.