<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by Vulcan:
The bus will board from a gate from the secure area, usually around the higher numbered gates in the newer terminal C area.</font>
Do they board the ABE bus from a jetway there?
It's odd that they actually drive passengers through the secure gates at the airport just to get access to the ramp. (Then again, its more odd that an airline offers bus service between two cities.)
So it looks like only ZFV-EWR works.