only on the immediate families but also the entire flying public. because i've been on four different planes since this happened, and there's always a question in the back of my mind. is this plane safe? i want to bring in dr. bob arndt, a veteran aviation consultant. are you there? >> i am. yes, i am. >> hi, dr. bob. listen, the theory, you have done, you've done a lot of investigation on possible theories about what happened to this plane, and how it may have come to rest in the ocean. you know, this plane flew for so long that it may than it simply ran out of fuel and then just fell into the ocean. what are your theory, and if that's the case, are investigators going to find larger pieces of that plane potentially? >> so, it's a great question. "wall street journal" this morning is reporting boeing is actually doing engineering simulations of the final few minutes of that flight. and it's very important, because