cockpit signed off with malaysian air control. so does that lend more credence to a potential mechanical failure as opposed to someone doing this deliberately? >> you know what, we've gone over that, the pilot here and i, and i'm not sure we have come to any strong conclusion as to whether this means that this was an accident or deliberate. if you have the shutdown over time, it certainly sounds deliberate. but the fact that the acars system would be first. why? >> you know, it doesn't lend any credibility to the theory that either way. it could have been mechanical, although i believe that it's highly unlikely. the systematic approach with which it was shut down suggests to me it was shut down by somebody. >> we could point out, wolf, the acars system could actuallily be accessed by going through what is sort of the big huge gps system. this is used how you input --