NASA takes to the skies of Europe
A NASA Armstrong Flight Research Center DC-8 jetliner pilot prepares to land on Ramstein Air Base, Germany, Jan. 31, 2018. The DC-8 pilot flew more than 40 hours over the skies of Europe for the bio-fuel test. (U.S. Air Force photo by Airman 1st Class Milton Hamilton)

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Photo by: Airman 1st Class Milton Hamilton  |  VIRIN: 180131-F-VQ832-1067.JPG