There used to be an EWR-JAC flight, I'm hoping with the merger of UA/CO (which sees lots of traffic to JAC) helps reinstates that route.
FWIW, is there isn't a way to get to RNO with one stop from ABE so for LV travelers it does require traveling to PHL. Jackson, Aspen, Vail, Steamboat, Telluride (via MTJ) are a few that can be done with one stop out of ABE.