disaster? >> it is very difficult. these aircraft are designed to withstand wind shear forces. it is unusual for an aircraft to break up due to a thunderstorm or bad weather. that's the first point. if, in fact that happened this same, we could be speculating on the possibility of wind shear or sudden changes in the speed of the wind which may have made the aircraft uncontrollable. the pilots may have lost control. in the descent, the aircraft may have broken up through stratos caused by the fall. the movement of a stalling aircraft. i said it earlier today and i'll repeat. we still do not know for certain this weather is what has caused the accident. the weather is certainly a