{HEAD ~ An intermediate point} from which to deviate the flight path is identified based upon {TAIL ~ an analysis} of the cumulative threat risk values of the grid cells, if the threat risk value of any of the grid cells intersecting the flight path exceeds the allowable threat risk 
{ HEAD ~ An intermediate point } from which to deviate the flight path is identified based upon { TAIL ~ an analysis } of the cumulative threat risk values of the grid cells , if the threat risk value of any of the grid cells intersecting the flight path exceeds the allowable threat risk
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH