doing at any time and it sends it to the ground. acars sent the last transmission at 1:07 a.m. it was expected to send another transmission at 1:37 a.m. but that never happened. malaysian officials said they don't know exactly when the acars systems went off in that 30-minute window. we did learn when it sent last communication there was nothing to indicate in the last communication pilots preprogrammed the turn to the west of that's one of today's key new developments. i want to bring back panel, mary schiavo, ntsb, kit darby, retired airline pilot, head of a consulting firm. tom fuentes, former assistant director of the fbi. clive, i wonder if i could bring you in first. if we could talk about the system and failing of the step,