Alternately, the aircraft fuel system control circuit may be upgradable to {HEAD ~ an optional aircraft fuel system control circuit} including {TAIL ~ a partially or fully populated jettison control circuit} 
including
Alternately , the aircraft fuel system control circuit may be upgradable to { HEAD ~ an optional aircraft fuel system control circuit } including { TAIL ~ a partially or fully populated jettison control circuit }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL