Plane crashes and car crashes are very different from each other.
In a car crash you are de/accelerating much more abruptly . In a plane crash you stop over a much longer period of time due to the planes massive inertia and the fact that the chunk of plane in front of you will absorb a lot of the energy.(unless you are sitting in the pilots seat and are crashing at a 90deg angle to the floor lol)
The brace position in plane crashes is designed to prevent your neck from experiencing whiplash and to protect your head from debris.
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