It took just three seconds last June for the U.S. to lose two ace test pilots and more than $700 million worth of aircraft when the Air Force's XB-70 Valkyrie, a supersonic flying laboratory, collided in mid-air with an F-104 Starfighter over the Mojave Desert. The crash occurred during a flight arranged for General Electric, maker of the Valkyrie's YJ-93 engines. G.E. got Air Force officers to approve a photo-shooting session in which the XB-70 flew in close formation with four other planes, all G.E.-powered.
Last week the Air Force issued a report...
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