Any good guesses on islands in the southern Indian Ocean that have runways of any kind?
Antarctica
My guess as to the island on his computeror is New Amsterdam:
http://en.wikipedia.org/wiki/%C3%8Ele_Amsterdam
It appears to be the destination of the 450knot flight path that the NTSB initially charted then abandoned:
https://www.facebook.com/178566888854999/photos/pcb.740971779281171/740971732614509/?type=1&theater