I think this interesting - OAG says that NY-TLV is the most underserved route in the US because there were 239,000 one-stop tickets purchased for the route in addition to 432,000 non-stop tickets. However we also see that Delta's additional flight 4 times a week is being dropped in the fall. So not sure how that squares away with it being an underserved route.

http://www.travelweekly.com/Travel-N...airline-routes

Topping the list was Jakarta, Indonesia, to Jeddah, Saudi Arabia, with 280,000 one-stop bookings in 2015. The first U.S. market appears at number two, as some 239,000 one-stop ticket segments were purchased for flights between New York Kennedy and Tel Aviv. By comparison, 432,000 people flew nonstop between those two airports.