Previous likely flight paths south:
https://www.facebook.com/178566888854999/photos/pcb.740971779281171/740971732614509/?type=1&theater
The third one [not on the map] for the current search area where the 811 Arc intersects the S20 Parallel would have meant that the plane was travelling the last five hours @350 knots along a path about 300 miles shorter more to the east and closer to friendlier ditchable waters near Australia with fuel still in the tank.