If you think CO is shrinking at PHL you would be amazeed how much U has shrunk at EWR over the last 8 years or so, U used to be EWR's #2 carrier. In the early-mid Ninties they flew to Buffalo, Syracuse, Rochester, Kansas City, Raleigh, Norfolk, Richmond, Dayton, Indianapolis, Jacksonville and possibly Greensboro.
And all on real jets too, DC-9s and 737s. No DH-8s, J-41s or RJs back then. I flew Buffalo-EWR on a DC-9 in '92.
Eastern Air lines flt # 701, EWR-MCO Boeing 757