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