While it wouldn't benefit me, the single flight I'd think was best for NW to add would be a NRT-LAS. I'm always amazed how many pax coming from Asia are going to LAS, and last month when I took the LAX-LAS flight it seemed almost the whole plane had just got off from NRT. A NRT-LAS would provide one stop service to LAS from a lot of cities in Asia, and probably boost revenue at profitable fares for NW.