Re: Australia anyone?
Not *quite* enough fuel to make that trip.
But, it's better than CNN's headline news has been suggesting. Wonderful notions, such as "Maybe it was hit by a black hole", "Maybe God took the airplane" and "Maybe a UFO abducted the airplane". Such is the mindless drivel served to we Americans.
Also potentially likely is that the radio went on the fritz, an emergency occurred (such as a cabin decompression), which necessitated an emergency descent and a triangular course to alert ATC to the malfunctioning radio. The misprogrammed autopilot then resumed a random course that ended up out to sea before the pilots could regain consciousness and control of the aircraft and at altitude, were unable to do so again.
It's as likely as every other guess and it's quite likely that all of those guesses and this guess are all equally wrong.
What is known is, the aircraft went wildly off course, made some bizarre course and altitude changes and is missing. What is certain is that it is on Earth. Somewhere. Quite likely on the bottom of the ocean.