In 1955, pilot Alvin "Tex" Johnston famously performed two barrel rolls over the heads of 250,000 people gathered to watch Seattle's Gold Cup hydroplane races on Lake Washington while flying a prototype of what airplane? (edited at 6:53 pm, March 25, 2016 (EDT))
Original question: In 1955, pilot Alvin "Tex" Johnson famously performed two barrel rolls over the heads of 250,000 people gathered to watch Seattle's Gold Cup hydroplane races on Lake Washington while flying a prototype of what airplane?
707 (or Dash 80 or 367-80)