What happened on Saturday?

The Malaysian air force says radar information suggests that a passenger airliner that went missing on Saturday changed course and headed west. The last surveillance contact put the Malaysian Airlines plane somewhere between Malaysia and Vietnam. But military sources say their radar records show that the plane started to turn around and may have flown right across the Malay Peninsula. The aircraft disappeared less than an hour into its flight to Beijing, and an international search effort has so far failed to find any wreckage.