> The "Cornfield Bomber" is the nickname given to a Convair F-106 Delta Dart, operated by the 71st Fighter-Interceptor Squadron of the United States Air Force. In 1970, during a training exercise, it made an unpiloted landing in a farmer's field in Montana, suffering only minor damage, after the pilot had ejected from the aircraft. The aircraft, recovered and repaired, was returned to service, and is currently on display at the National Museum of the United States Air Force.
Given it's a military plane (which IIRC, aren't required to have transponders or have them activated) and stealth. it seems understandable that it would be hard to find if it didn't crash immediately.