chris hart, former ntsb chairman thank you. >> well, let me add one more thing.t's important you mentioned in the introduction, it's important to note that the pilots who have -- who are the experts in this and they certainly have as much at stake as anybody, as they say the pilots are the first to arrive at the scene of the crash, they are not calling for grounding. so that speaks volumes that they are not calling for grounding. plus the fact that this airplane has thousands and thousands of event-free hours so i think there are lots of reasons why grounding is not appropriate for this type of situation. >> good point. individual pilot spends a lot more time with that plane in the air than any passenger >> precisely >> thank you >> precisely >> chris hart. >> thank you >>> sticking with boeing, i sat down exclusively with the u.s. army secretary mark esper yesterday for a wide-ranging conversation on defense spending, the military's view on artificial intelligence, and a whole lot more, including his thoughts on boeing, which is a top contractor to the defense d

metro rail safety commission, chris hart. vice president of equity research, covering airlines, joe kaida. chris, thanks for joining us after yesterday. >> thank you for having me. >> more opinions on how long a grounding could last some analysts say three to six months for eventual certification, does that make sense? >> that's a good question. this is uncharted territory. we never in the u.s. had a grounding for any reason other than catastrophic mechanical failure the pilot couldn't fix in the moment. the two were the d.c.-10 when the engine separated from the wing, and the boeing 787 in 2013 when they had lithium ion battery fires. those are events that are disabling, nothing the pilot can do about it in the moment, those were obvious reasons foregrounding. here is a different scenario you have automation usually reliable, occasionally it fails, sometimes when it fails, a small percentage of pilots don't know how to respond to it properly. others did respond properly, small percentage doesn't that raises a question about w

. >> thank you very much >> let's continue the discussion and bring in chris hart former ntsb chairman. chris, thanks very much for joining us last night, the faa issued a statement saying once again, that they see no systemic performance issues and provide no basis to order grounding of the aircraft what do you think has changed in the last 18 hours or so? >> well that's the big question. thanks for asking me i'm getting reference to new information and speaking in the blind because i don't know what that new information might be. i would just note that this is unprecedented, not open in the state of knowledge as was previously mentioned, but in the basic nature of this recall. the battery grounding was based upon a mishap that once it occurs the pilots can't do anything about it. that makes it a very challenging -- since the pilot can't do anything about it, it's a single point failure and -- which pilots can't do anything about whereas in this case, pilots can do something about it and that's what was going on was that pilots were being trained to be able to respond to this problem.