The Malaysians might have shot it down as it doubled back over Malaysia in the middle of the first night. Could be in some deep jungle on the peninsula now being guarded by Malay troops.
That was my first thought and it still seems as good a possibility as any advanced by any agency, government, journalist or FReeper.
Possible, although I read that anything like that would have been noticed by the Chinese or would have appeared on some satellite somewhere. Of course, I’ve read so many things by now - that who knows?