Airplanes have transponders which receive and transmit signals to communicate {HEAD ~ information} regarding {TAIL ~ the flight} of the airplane 
Airplanes have transponders which receive and transmit signals to communicate { HEAD ~ information } regarding { TAIL ~ the flight } of the airplane
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH