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