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