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Popular they don't know how much time it's going to take and how long the lines will be out of service by the time investigators get their work done. how long it will take for commuters to get their service back online between new york and boston. >> susan, what are some of the things they are looking into as to how this happened in the first place? >> reporter: as the investigator was telling you, they are looking at the braking system. they are looking at the possibility of human failure. they will be talking to passengers to see what they might have heard and seen. there might have been bra...

Million flights. veteran aviation safety expert john cox. >> what's significant about that is that we're improving by 50% over last year, which was the aviation's safest year previously. >> reporter: why the improvement? pilots have never been better trained. computerized cockpits monitor every aspect of flight. alert systems warn of a potential mid-air crash or mountain ahead. hd simulators for pilots and air traffic controllers train them to handle emergencies before they face a real one. debbie herzman is chairman of ntsb. >> we've learned from accidents, plowed those lessons back, in they'...

Veteran aviation safety expert john cox. >> what's significant about that is that we're improving by 50% over last year, which was the aviation's safest year previously. it's an incredible feat. >> reporter: why the improvement? pilots have never been better trained. computerized cockpits monitor every aspect of flight. alert systems warn of a potential mid-air crash or mountain ahead. hd simulators for pilots and air traffic controllers train them to handle emergencies before they face a real one. debbie hersman is chairman of ntsb. >> we've learned from accidents, plowed those lessons back i...

>> our seats, 14 abc i think are totally disconnected. >> somehow in the installation process of our seats we introduced a failure. not sure mechanical failure or human failure. >> reporter: american saying it identified what caused three flights to be aborted in mid flight because seats came loose. in one case, flipping passengers on their backs. the seats came in rows of three. and the row is held to the floor with what is called a saddle clamp. it's that clamp that was improperly installed on the planes where the seats disengaged. >> on the safety side of this particular situation, american...

>> and so we don't be brog a man, -- we don't be brog a man. you go up and down and i will get a car elevator too. >> you are a human failure. >> i will say i would like to have an elevator in my car. i am short and just have me go up so it would be wonderful. will romney never, never be on the cover of in touch magazine because he is so out of touch with america? >> it doesn't matter. there are many things to takish you you with -- take issue with, but to have somebody in the white house that knows how to make money is not something i would be angry about. i understand the appeal of having so...