Because a pilot can control a plane when GPS is down, when jamming prevents remote control from Creech AFB, and because the Mark One eyeball is still pretty good.
A pilot still uses eyes, gyroscopes and has an understanding of terrain and how to manipulate a flight controls to make the aircraft go a certain way. Presumably all those things can be done by technology, terrain following, and autopilot systems are not new. If jamming detected it can return back to destination. I am sure it can be done for less than $1TN
