<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by JS:
CO 4600 is ITO (Hilo) to HNL, operated by HA383, a B717. Also known as NW9183.
All the EWR-MKE flights with CO flight numbers are CO Express ERJ's. I wonder how CO4600 ended up in EWR as a YX plane.</font>
it was NW4600, not CO4600.