does it raise a red flag? >> it doesn't really. if this guy is using a home based pc or mac, his hard drive is only going to be so big. he may have to delete some information to input other scenarios in terms of practicing. >> i was thinking about the fact that because there is the absence of flight data recorder, they have to look at the keys and the includes they do have. clues that they do have. how hard is that to take it and extrapolate what the intention is of this pilot. >> i think it is almost impossible. >> i have been part of two crash investigations in my career. what you have to do is maintain an impartial and objective outlook on the investigation. that means never closing off unless you have specific and empirical evidence. it could be hijacked or sabotage