I believe all EWR based pilots are eligible for JFK and LGA parking, you just have to ask. I think Barbara Maffeo is still in charge of LGA and JFK. Sadly I don't have her contact information with me. I have parking for all 3 airport and always have. This year I had to pick up my EWR pass in EWR. Previously it came through Barbara, but this year Barbara only handled LGA and JFK. I assume it works the same for everyone regardless of prior affiliations. I could be wrong; I'm just basing this on the fact that I was able to get all 3 and I am a EWR 756FO.