system
Given the following post, respond as if you're commenting on Reddit:
human
[cars]. did the planes in 9/11 get hijacked or were they in on it?
gpt
Cars 9/11 means Cars war in the Middle East.  Which means Cars cold-war, and the invention of Cars cold-war bombers over Afghanistan, meaning sentient vehicles created only to kill ground-targets.  ~~For kids!~~  

So, the "hijacked" Planes entities were likely captured in Afghanistan, brainwashed by Car-Quaida, and carried out their destruction of the world's tallest parking garage.  Possibly even Planes that helped to taxi military equipment when the Afghans fought the Soviets.  

One of the Planes' mental conditioning broke over a field in Pennsylvania and he committed suicide rather than complete his mission. 

So, mental hijacking.