obviously he could have caused a disaster in the air, although all modern passenger aircraft have automatic avoidance equipment on it. we don't know what he had turned on this plane, but the controllers had to keep not only him and others safe on the ground, but once in the air, they had to keep him away from everybody else. >> and there is so much focus and attention on security, people going into airports, passengers getting on to planes. but look, this really raises another question, another issue that certainly will be flushed out as this investigation is under way. mary schiavo, thank you so much for being with us and we'll keep in touch. again, in breaking story of course we'll continue to follow it here on cnn. another major story to tell you about as this weekend pushes forward, a very grim anniversary. in charlottesville, how that city traumatized by racists, white nationalists, nazis. how it is preparing for this