The advantage of that route would be a lack of radar to detect the presence of the plane.
It would suggest the plane veered westward from Kuala Lumpur, through the Malacca Strait, then further west and then south of Indonesia in the Indian Ocean, where presumably it could travel back eastward between Australia and Indonesia undetected.
The destination would then be either in the Indonesian islands of Nusa Tengarra, or North to Borneo and East Malaysia.
In the Adventures of Tintin, volume 22 is called "Flight 714" (1968) and the plot concerns a hijacked airplane taken to Nusa Tengarra.
But why would anyone hijack an airplane and take it to that area? To land in a remote area, refuel, and then use the plane as a missile, like on 9/11?
But as time goes on, chances increase that the plane would be discovered and the plot thwarted, so that is unlikely. It seems more likely the plane crashed in the Indian Ocean.
In the Tintin story, a millionaire was kidnapped with the intent of stealing his money. That seems not a possibility in this case.
It remains to be seen whether the Chinese passengers were selected for any particular purpose, such as a statement about Xinjiang, or if they were merely in the wrong place at the wrong time.
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