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>> a pilot could pull up in the shadow of another plane and it would disguise the blip. you would only see the information from the first plane and wouldnt see thel blip from the second plane. the first plane being shadowed would see the other plane pulling up or they would pull them up -- theres cockpit equipment that shows you if another plane is in your immediate vicinity. >> if not in the air, could something or someone have interfered with the plane from the ground? >> is it possible that t...