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By the president of the united states himself. >> that is in fact the difference. jim, let's talk about these devices. the information we're getting is they were real. they could actually have exploded. what about what we know about this is going to help us figure out who and why? >> you've got to look at the make-up of the bomb. you look at the bomb carefully to see if you can zurn who the bomber is. you talked about a timer, it's been reported the bomb has a timer. timers aren't normally used in mail bombs. a digital timer here is most likely a safe arms switch. it's used by the bomber so he...

The information we're getting is they were real. they could actually have exploded. what about what we know about this is going to help us figure out who and why? >> you've got to look at the make-up of the bomb. you look at the bomb carefully to see if you can zurn who the bomber is. you talked about a timer, it's been reported the bomb has a timer. timers aren't normally used in mail bombs. a digital timer here is most likely a safe arms switch. it's used by the bomber so he can carry the package, manipulate the package, put it into the mail stream, get it out of his car and it won't detonat...

I think the simple answer is they are not black boxes, they are not rugged, therefore, they break. >> question from joe, but before we go to that, from everything to fail on this plane, just seems like the perfect sort of scenario here, all the elts failed, other communications failed, nobody can find anything. come on. that's stranger than fiction. >> well, this whole entire mystery is stranger than fiction, but in terms of the elts, let's understand specifically how they work. there are options in aircraft, including commercial aircraft, to have an on, off, and arm switch in the cockpit for ...