To protect you and others, just like in a car.
First up, turbulence. It keeps you in your seat during heavy turbulence. Otherwise, you’d turn into a projectile, and get flung into walls/ceilings/floor/people. People get injured in turbulence quite a lot, and seatbelts help prevent this.
Secondly – crashes. In the same way as a car accident, a seatbelt stops you becoming a projectiles, and can prevent more serious injury. Without a seatbelt, your chances of survival drops.
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