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A complex aircraft called the Preliminary Research Aerodynamic Design to Lower Drag, or Prandtl-D, is seen in a NASA handout picture during a test flight at Armstrong Flight Research Center in Edwards, California October 28, 2015. Resembling a boomerang, the aircraft features a new method for determining the shape of the wing with a twist that could lead to an 11-percent reduction in fuel consumption, according to a NASA news release. In this photograph, the Prandtl-D No. 2, which had a 12.5-foot wingspan, lands following a flight test. (Photo by Ken Ulbrich/Reuters/NASA)
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