Nope - that's a rerouting change these days. Moreover, if you flew into JFK then JFK-EWR ground segment would be one of your 16.

The way to avoid this is to force a paper issue by using open-dating, and get the relevant coupons ticketed to/from NYC. Make separate stand-alone reservations direct with the airline and simply give them the ticket number. (Caveat: this used to work fine, but I haven't had cause to try it for the last few years.)