This image from the New York Times shows why the "two corridor" theory exists.
Spoiler'd for size
Quote:
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A satellite orbiting 22,250 miles over the middle of the Indian Ocean received the transmission that, based on the angle from which the plane sent it, came from somewhere along one of the two arcs. One arc runs from the southern border of Kazakhstan in Central Asia to northern Thailand, passing over some hot spots of global insurgency and highly militarized areas. The other arc runs from near Jakarta to the Indian Ocean, roughly 1,000 miles off the west coast of Australia.
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http://www.nytimes.com/2014/03/16/wo...flight.html?hp