There is a wedding next year & I can't find anything that allows for a no rental car trip, is there anything in private shuttles or busses that are tough to find?
You also need to get to take either a train or Uber from the airport to 30th Street Station for train to Atlantic City. There may be some private limo services but it is about 90+ miles to Cape May from PHL.
We used to use Delaware Limo to go NYC from Wilmington DE ( not far from PHL) for a group. I bet they would do a PHL airport to AC or Cape May run. Not sure how expensive it would be. Our trips were a group of 10ish from work so the cost was covered. We did vans, small bus and limos depending on how many were in our group.