Western Flight Path is dead... stick a fork in it.
Portland radar operator, East of the center of V23. Ammerman was watching the less accurate Salem..
The chase aircraft following 5 miles behind veered East then made a right turn.. small airfield marked with parachute, marked on map just N of Orchards would be close to where the unsub left the plane. This matches the FBI map.. and rules out the Western flight path.
Ammerman confirmed sending the chase planes E just N of Portland. It was after Cooper was thought to have left the plane. (before 8:15)
lights of Portland... in FBI file
It just occurred to me that if Cooper could see the lights or glow of Portland/Vancouver he probably would not jump into an urban area.. a knock against a Columbia R jump.