It's not clear to me whether this solution is stable. The air flow looks very turbulent. Maybe if the air vents are blowing at a slightly different speed or if

It's not clear to me whether this solution is stable. The air flow looks very turbulent. Maybe if the air vents are blowing at a slightly different speed or if you have a few empty seats, the dynamics change a lot and you go back to a chaotic circulation pattern. Also, most airplanes have individual vents as well that can be adjusted... how would those affect the flow?