one airline company is using a DMR frequency 464.600. FCC database says that it is American Airlines but it could be wrong. I programed the frequency as a DMR One Frequency with ID search mode on my 436HP and got a ID of 1001 and sounds like baggage handling. There is another DMR One Frequency system at the airport 464.150 and getting an ID of 1 Operations? and a 200. Not sure the name of the system. Prime flight aviation services maybe? FCC doesn't list it