............. I know the copilot was young............
I wonder whether he had a pistol pointing to his left, as he muttered Allah Akbar!
Thus no Mayday, no communications, no further radar pings as the co-pilot turned off the tracers, maybe all the electrical systems.
Allah Akbar!!!
Also possible. ‘Young Muslim copilot with a gun’ is all it took. Didn’t the aircraft ahead of them say he heard mumbling sounds (injured pilot?) and interference when he called them?