EK is not a point to point carrier, it's a classic hub and spoke operator with geographical and cost base advantages. There are numerous options west from NCL with BA, KLM etc, there's one way east mopping it up. People get blinded to this as EK operate one heavy to their hub daily whereas the others operate numerous narrow bodies.
If NYC is even an outside possibility, who would operate? See my post above as to who is unlikely to try.
What makes you think Delta can make JFK work from NCL when it failed at EDI and manages MAN only peak summer each year?