Originally Posted by
star_world
Definitely not. EWR is carved out from a routing rules perspective to allow UA to charge a huge premium for its routes from there.
You probably had an agent who was from the UA subsidiary and assumed it was treated as NYC.
For purposes of SDC, LGA and EWR are treated the same, but not JFK. I have many times changed from EWR to LGA but not to JFK unless it is irrops. YMMV