Linked from
The 9 pages that link to Airbag, each with the reason it gives.
Automotive safetyRelated: Airbags supplement seat belts by reducing impact with interior surfaces.
Seat beltRelated: It works with the belt, which positions the body for effective airbag protection.
Steering wheelRelated: A driver airbag is commonly housed in the steering-wheel hub.
Luna 9Related: Luna 9’s spherical capsule used inflatable cushioning to survive its final impact.