18960, I have listed as NHRMC Vitalink. According to a friend of mine that works there, they mainly use the New Hanover TRS, but they have a TG on VIPER so their units can go statewide and talk back to their dispatcher in Wilmington. I'm sure that AIRLINK has the capability to use that TG as well as the VitaLink ground ambulances.
I know AirLink still uses their VHF frequency as well when they travel to other areas to talk back to Wilmington.