In a second aspect of the disclosed system and method, {HEAD ~ the aircraft fuel system} 100 may lack {TAIL ~ a pre existing jettison system} 150 
lack
In a second aspect of the disclosed system and method , { HEAD ~ the aircraft fuel system } 100 may lack { TAIL ~ a pre existing jettison system } 150
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH