Originally Posted by
JJ21
"Also airliners do not have targeting radar that can track other aircraft."
you dont need radar you just need a clear view out of your cockpit window to see the nav lights of another plane.
To run a rejoin you need someway to estimate range. I forget the exact numbers but if two aircraft are pointing at each other (ideally they are 180 degrees out with parallel tracks offset by about 8 miles), both going .78 mach, you need to start the 180 degree turn at something like 20 miles to end up within a mile or so of each other. Cant be done with eyeballs alone.