There's a technical fix to ensure civilian airliners aren't shot down

The awful crash of Malaysian Flight 17 in the Ukraine combat zone seems likely to have been caused by a long-range surface-to-air missile. At this writing, who launched the missile remains undetermined. Regardless of who's guilty - why is a modern software-driven weapon capable of striking a civilian jet in the first place? All commercial airliners send out transponder signals that identify them as civilian. In most cases, what's employed is a protocol called Mode C, which is not used by militar

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