Convair B-36 Peacemaker it is! As an early teenager I recall these aircraft flying over our house. Although they were up at 40,000 feet the pictures on the walls of our home would start rattling and our front door, which was loose in the jamb, would start resonating violently and of course the entire house would shake. It would last for 3 or 4 minutes. I cannot imagine what the psychological effect would have been on an enemy when a fleet of these monsters would have flown overhead. About 400 were constructed and only FOUR remain.