repeating steps – until each grid cell intersected by the modified flight path has {HEAD ~ a cumulative threat risk value} below {TAIL ~ the allowable threat risk} per grid cell, or until another stopping condition is met 
below
repeating steps – until each grid cell intersected by the modified flight path has { HEAD ~ a cumulative threat risk value } below { TAIL ~ the allowable threat risk } per grid cell , or until another stopping condition is met
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH