house. the airborne objects also pose a threat to civilian aircraft. cnn aviation analyst mary schiavo says america sat risk until we know more about these objects. it s clearly a hazard to aviation as well. these objects fly, or floating at 40,000 to 60,000 feet. u.s. commercial and other aircraft, private aircraft, and military aircraft can operate at those levels. it s close to the ceiling of the commercial air craft, of course, how high the plane can fly. the pilot it s sent up to check the objects out have said in some cases, their communications were interrupted. they said they ve been difficult to see. they don t put out the usual signals to identify themselves which would allow transponders and most importantly collision avoidance equipment to work. and then, of course, every time one is spotted, aviation has to be moved away. there has to be a restricted zone and military flights have
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