there is a possibility that the plane flew towards West and then south, but changed its course towards right heading back towards West to mis Sri lankan radars and the maldives and US Base atr Diego Garcia and then tried to fly towards North heading for possibly nations like Pakistan or Iran but may have run out 0of fuel and may well be lying in the Arabian sea, other than this it may well have landed in some part of pakistan, who wouldn't know like they didn't know bin laden was living right in their army barracks back yard!
One lady (Sarah Balc) whose husband worked for IBM, who was on that flight refuses to believe that her husband is dead and claims the authorities are hiding actual facts, so there is got be another reason where the plane is.
I should also add that there had been reports of independent witnesses having seen a plane go very low over some houses on one of the Island in the indian Ocean and another lady returning from Mecca in a flight saw a plane submerged in shallow waters near Maldives , she saw this through her plane's window and alerted otyers but was dismissed that the object she saw could not possibly be a plane, thats is I suppose no one would believe a plane can land in shallow waters and possibly sink later on .
All these articles can be searched on google.