let's bring in our safety analyst david sousie. everybo soucy. you've heard that this has happened before. what's your analysis? could it happen again? could it happen here in the united states? >> well, yeah, actually it could and it has. if you think back to just chicago a few short months ago when there was a fire down in the lower section of the control center, this is the concern, is that if there is a single point of failure and it's supposed to be designed not to do that, if there's a single point of failure because everything is integrated, that single point of failure has impacts that are far-reaching, as you mentioned before. it's going to reach far and wide and could be months before this gets back to normal. >> and the investigation, i assume, only just beginning. they say it wasn't a power outage, although that was the initial suspicion. what other problems could generate this kind of air traffic problem crisis, let's call it? >> well, the part of the software that failed, as i understand it, is the scheduling part of the software. w