The aerial refueling aircraft used in Operation Epic Fury were created from a single $16 million Boeing prototype. See the 'Dash 80.'

The prototype for the 707, the Boeing 367-80, shown here, was named by the Smithsonian Institution as "one of the 12 most significant aircraft of all time."

Museum of Flight Foundation/Corbis via Getty Images

• The Boeing 367-80 Jet Transport prototype led to the development of the Boeing 707 and KC-135.
• Known as "Dash 80," the Boeing 367-80 flew for the first time in 1954 and revolutionized air travel.
• Only one was ever built, and it lives at the National Air and Space Museum's Virginia location.