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Off in air france flight 447, so how complex a task is without pingers to locate these things? is it just searching a grid? >> as long as you have a place to start, running back and forth plowing the field and hoping you don't go over a spot, think the aircraft is not there and go on to the next spot. you don't want to miss it if it's sitting right below you. >> les, i know we talked to david about this, after the air france crash, there were new safety guidelines about the length of time that a pinger would be able to go for, for 90 days. but that's only in new aircraft from 2015 on. the old ...

The information is accurate, it went on for hours well off course. does that line up with the theory of suicide? >> if you look back at the egyptair 990 story, there was a lot of recriminations that were focused on the family of the first officer who was implicated by the ntsb on a suicide mission. of course the egyptians deny it all. so what we're talking about here is the possibility, and we're not saying this is what happened, but the possibility there was a suicidal crew member who might have been worried about some sort of stigma associated with suicide, particularly in the malaysian cult...

For whatever reason the pilots were able to either dupe the hijacker or somehow take control of the plane in some way. but perhaps they thought there was a bomb on board and the same thing to do was to park it in the ocean like shanksville pa. >> we simply don't know. again les abend, miles o'brien, appreciate it. up next a remarkable rescue caught on video. an apartment building under construction in houston went up in flames. a working trapped on a balcony with the flames approaching. we'll talk with the firefighter who is out on that ladder there desperately trying to get to this construc...

Airline and go through our careers, there isn't a whole lot unless there's something affecting our job performance. >> i would imagine other pilots, co-workers keep an eye out for any anomalies. >> we watch each other's backs. we really do. >> miles, it is important to point out like everything else, this is just something that investigators are looking at. because again without a suicide note these pilots could just as well have been heroes to try to stop this plane from going into the water as something nor nefarious. >> there is a scenario you can add to the list where somehow they were com...

Lot of recriminations that were focused on the family of the first officer who was implicated by the ntsb on a suicide mission. of course the egyptians deny it all. so what we're talking about here is the possibility, and we're not saying this is what happened, but the possibility there was a suicidal crew member who might have been worried about some sort of stigma associated with suicide, particularly in the malaysian culture. if you wanted to commit suicide in such a way that you couldn't be implicated, this would be a way to do it. >> going to a very far, remote area where the difficulty o...