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