Capt Kremin,
excellent post. Probably the unpublished ping arcs fit quite exactly your 197 solution. Would that be the HDG to return from IGARI to KUL ??
That may be the reason why all SAR is concentrated south.
Tim Vasquez has something identified, that could be a contrail belonging to the HDG 197 solution. INHO a must read:
Investigation of a possible "southern arc" contrail from Malaysia Flight 370 - 8 March 2014 - Weather Graphics
