Two pilots whose planes collided near Ketchikan in 2019 were unable to see or detect each other until a midair crash was unavoidable.
"Brice Banning"
NTSB: Rep. Gary Knopp, who piloted plane involved in fatal crash, had impaired vision
An updated medical report says Knopp was denied medical certification to fly because he had glaucoma in both eyes that led to a reduced field of vision.