I agree Kremmen. And if we include satellite tracking into the radar tracking system then it is reasonable to believe that nothing moves on this earth without the 'authorities' knowing about it.

Matthias Chang, prominent Malaysian lawyer, author and former Prime Minister Dr. Mahathir Mohamad’s political secretary and adviser.

Malaysia is a poor country lacking technology of America, Britain and Australia, Chang asserted, asking, ”How can a plane that took off in Malaysia going to Beijing ‘disappear” with all the technology at hand and even more SAR experts in the area at the time? “How can the United States of American, Britain, and Australia –  all the military powers – not be able to know where the plane is? NSA intercepts every phone call of every citizen in the world. America has launched a satellite that can detect the size of a coin and see underground bunker, yet today, there’s no information from these advanced satellites?”
 “Everyone seems to focus on area near Australia. Look at the world map,” he commands. “A plane flying away from Kuala Lumpur, that went northward toward Thailand, turned back southward, then flew toward Andaman – any elementary school student would know it went toward Diego Garcia, the most sophisticated military air and naval base. It was used for wars in Afghanistan, Iraq and Vietnam. Yet even the most advance data at that base cannot tell us where the plane is? Surely any plane going near there would be a threat to that base that also has nuclear submarines. No radar shows the plane was in that path? What happened to that radar and satellites?”

Not knowing too much about the subject. But, how far can ground base radar see? I thought it was just line of sight. So once the plane is over the horizon, that's it.

Diego Garcia - was a 9/11 type attack being planned? Was it shot down on its way there, hence the lack of public information?