unbelievable there. >> here's what bill asks. other 777s experience software malfunctions in the past. could it have sent the play to stall and plummet on this flight? >> i'm unclear about your question. the airplane is a very stable aircraft and easily controllable by trained pilots. they just don't fall out of the sky. >> i have something here quickly we have to get to before the top of the hour. someone says a pilot -- the same pilot says i say good night all the time. and i say good morning. if the ttcas was turned off you wouldn't know if an airplane was near you. commercial airplanes don't have radar that picks up airplanes. it's for weather and traffic