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POPSNazi Stealth Jet Could Have Won War for Hitler This craft did test fly in Germany during the war, but when one prototype had a flameout in one of its engines, the resultant crash landing killed its test pilot. This plane looks remarkably like the British Swallow. The "Tailless Swallow" is the craft that killed Geoffrey De Havilland when he was trying to break the sound barrier. It broke apart in mid air and ended Britains attempts at breaking the sound barrier...