Thank you Mark for letting me know there are sidewalks, I've never done this and the street view from Google didn't look promising. There is a problem with the 608 bus though. The flight to CVG leaves at 210pm. There are no buses that go past Sullivan Way at Edgewood between 838am and 318pm. That is over 3 miles away from the terminal.
BTW, the airport did apply for Federal Funds to create a shuttle to the Trenton Transit Center and the West Trenton SEPTA station but were denied. They are looking for alternate ways of funding.