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Yesterday flew -- he took off in maryland flew for more than an hour in his aircraft into obviously very very restricted air space. how was he not detected sooner? how did he pull this off? >> certainly. as you describe the washington, d.c. air space is the most restricted air space in the country. he took off about 33 miles northwest of the city. but the way they detect aircraft is through the use of transponders which gave a radar beacon to the faa air traffic controllers, as well as the material on the aircraft reflecting off radar signals. in this particular aircraft he doesn't have a lot ...

That's because according to investigators, everything is on the table. in fact, officials now believe the plane might have been sending out electronic signals or pings four to five hours after its radar beacons stops transmitting. tonight we've just learned that u.s. officials believe the radar beacon or transponder was shut down separately from the system that continued sending out the empty pings 14 minutes apart. that could be extremely significant. american investigators telling abc news that the two modes of communication were quote systematically shut down, which makes for a very big hou...

Needed as the crews got there, because as you have mention and confirmed that all 224 people lost. richard. >> ron mott, standby. and now, as you hear speed of 400 knots down to 60 knots which is losing 80% of the speed, and what does that tell you? >> well, it tells you that the automatic computerized flight control system was not working. actually there is three of them for redundancy, and for all three of them not to work, that is a loss of electrical power, and also nup in the beacon, the radar beacon that is used to track the plane went out quickly. and so the thing that, you can count on...