I moved to Philadelphia a year ago and have now "flown" ex-ZFV twice going abroad without problem. I don't recall clearly, but think united.com showed ex-ZFV as an option both times. Can one count on united.com to show ZFV possibilities or must one search with ZFV for "from" or "to" not to miss fare-saving opportunities? Will checking "nearby 'airports'" reliably bring in ZFV?

If one presents themselves at ZFV or EWR before time for scheduled train, will they be allowed to go on an earlier non-Acela one?