have you to keep the investigation going. there's a lot of evidence still out there to collect. you go to the airline, get all the background information on both flight crew informations, crew records, you understand the training history of not only this flight crew but a number of flight crews. there's a trend there. >> that's what they're working off now, that kind of archival history. >> i would hope that's what they're doing. you have to get not only that information but you want to get all the dispatch information, the weather information that was given to the crew how they made that joint decision to launch that flight on that date rather than delay it or cancel it, because there's been a lot of talk well other airplanes went through the area. that's true. however, we don't know if they were at the same altitude. we don't know what the basis of these pilots' decisions were which would be good information to get to see what they knew that the accident crew didn't know. >> and a lot of that will come from the black box f they're able to find it. you're saying this plane was not aztec logically advanced as other planes.