Okay, ACY is served by Spirit and US Airways Express. They also recieve numerous charters.
Spirit Airlines serves: CLE, FLL, MCO, Myrtle Beach, Ft. Myers, TPA, and PBI.
US Airways Express serves: PHL
Personally, I think the PHL-ACY flight is a dumb idea by US Airways. A ticket costs $229 dollars. There is a train, New Jersey Transit, that runs this same route. The ticket costs $6. The trick is the train takes twice as long (1h 30m). But there are 14 trains daily, and only 5 flights. I still would take the train because I like NJ Transit more than being on a US Airways Express Beechcraft 1900. Take your pick everyone.