hearing the results that have. >> miles, if it was in the air, do that in and of itself indicate it was an incendiary device or could you get a heat flash from an engine malfunctioning or exploding on its own? >> that could happen. the number of flashes are the key. if there was a muffle launch you'd get an infrared flash for the launch itself and a second flash, a second infrared signature for the impact itself, and possibly even a third when the structure struck the floor of the desert as further fuel might have exploded, so the number of heat signatures is crucial. if in fact only one was detected, that in some respects might steer one away from a missile launch and on to some idea of an explosion on board the aircraft. >> there's been so much focus on a missile, but there are other ways, you know, as we've learned