We drive to JFK with a one way rental from CT. Drop off right at the terminal and have either (1)rented a car for the return, again one way or (2) had a car service bring us back to CT.
We have never paid a one way drop off charge. Lot of time we drive to the airport with the rental car, drop it off at terminal drive and get the hotel shuttle back to the hotel if we are taking an early morning flight. Lately, it seems as if this is the bet way for us to travel to an out of state airport.