ntsb as well as the u.s. air force. welcome, sir. >> thank you, carol. >> and i should also mention you're the author of the book "air safety investigators: using science to save lives one crash at a time" so you are the perfect person to talk to this morning. the voice and data recorders have been recovered. how soon will we know something? >> i would imagine the egyptians will release some details within the next -- certainly within the next few days. of course, they have the physical evidence, the wreckage there, so we'll know more about potential terrorist acts or explosions or missiles within a matter of days, i would expect. >> supposedly this plane virtually disintegrated at 31,000 feet. people were still strapped in their seats with seat belts on when they were found on the ground. how unusual is this type of catastrophe? >> well, of course, air disasters in general now are