Suleiman
Posts: 543
Joined: 9/9/2004 Status: offline
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Fly at a high enough altitude and that's not a problem. Please keep in mind the invisible jet concept was first introduced around 1946, when jets were very new and the only reliable way to spot an airplane was to look up. Jets flew so high they were barely findable, and they made so little noise the elaborate listening aparatus of the time could not make them out. There is a reason why the invisible jet was phased out back in the seventies, after several attempts at revamping the durned thing.
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