Then ask Delta Airlines. That stuff changes so fast, depends on where you are going through security, and how the local station chief interprets the current regulation.
Call the airline.

I certainly would be nervous if some one had a radio transmitter in their on-board bag.

Do like I did with my .44 Super Blackhawk while driving through Canada to Alaska. Send it Fed X . Even do it "Will Call" to pick up at the local office when you get there.