FIGURE A.1 A collection of NASA’s research aircraft on the ramp at the Dryden Flight Research Center in July 1997: X-31, F-15 ACTIVE, SR-71, F-106, F-16XL Ship #2, X-38, and X-36. SOURCE: NASA Dryden Flight Research Center Photo EC97-44165-149 by Tony Landis, http://grin.hq.nasa.gov/IMAGES/LARGE/GPN-2000-000172.jpg.

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