Do you have a shuttle service? Here in NJ we have a service called Rapid Rover....they pick your party (and luggage) up from your home and drop you off at the airport. It's a better deal for us when we fly out of PHL....parking at PHL typically runs about $100 (with tips)...and toll to cross the bridge. Rapid Rover doesn't charge for the kids, so the adults are usually about $40 (total).
Flying out of ACY, Rapid Rover charges over $100 because you're going near Atlantic City...parking at ACY is about $80 for our stay and you can express pay with your EZ pass.
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