The Malaysian PM is quoted as saying
"have determined the plane's last communication with a satellite was in one of two possible corridors":
a northern corridor stretching from the border of Kazakhstan and Turkmenistan through to northern Thailand
a southern corridor stretching from Indonesia to the southern Indian Ocean
I understand that these references to corridors is based on a (presumably geo-stationary) satellite above the Indian ocean detecting signals from the a/c.
But if that's the case why refer to a 'corridor' implying a long, but limited width area?
If the satellite can't detect position/bearing or distance, which presumably it can't (otherwise there'd be no need to mention N/S corridors), then presumably the search area would be anywhere in the line of sight, limited only by the range of the a/c.
Or am I missing something?