And if that last scenario seems unlikely, you should know that tonight it is possible. Thats 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 weve just learned that u. S. Officials fwlooefr ray dan beacon or transrespoponder was down separately from the system that continued sending out the 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 hour ahead starting with our jim clancy. Reporter 2200 nautical miles. Thats how much farther u. S. Officials say Malaysia Airlines flight 370 might have flown after losing contact early saturday morning. Investigators now believe flight information from the boeing 777s engines continued to broadcast automatically for as m