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