How exactly can this plane hide if it did not crash?
It couldn’t hide. No nation would keep its landing a secret.
India has a good 24/7 air traffic and military radar system, so does Burma and Thailand.
FL370 could have tailed another airliner and hidden in its radar shadow. But there would no point to a jihadist doing so with out making an attack which hasn’t happened.
The motive of the pilot was to evade detection. That happened as soon as FL370 reached flight elevation and turned off the ACARS. He turned off the transponder as soon as he was beyond Kuala Lampur air traffic control.
All the data points to a run to the S Indian Ocean to ditch where the waters run deeper than out subs can go.
Have you ever seen a airplane hanger? It fits inside a big one. Enough camo netting and that would probably work too. Can't just cover the airplane, but have to stretch it out in in a shape that doesn't look like an airplane. Many layers. Expensive, but a whole lot less than the plane is worth. Even on the used market.
But its highest value would come as a suicide bomber. Change some of the avionics and it could spoof air traffic control.