Daredevil test pilot who barrel-rolled a Boeing 707 on the aircraft's demonstration flight.
He flew for the first time at age eleven and had become a solo pilot and barnstormer by the time he had reached his mid-teens.
He landed the barrel-rolled 707 safely and was reprimanded by the president of Boeing.
He and his wife, DeLores, were married for more than sixty years.
Johnston's maverick style may have inspired Slim Pickens' character in the film Dr. Strangelove.