Why aren’t car-like 3 point seatbelts used in planes?

Question

Why aren’t car-like 3 point seatbelts used in planes?

In: 444

Answer 1

There are 2 most important consideration about seat belt connected to specific dangers:

1) when plane crushing passenger can fly up and break they neck, thus passenger should be stick in place with belt

2) non fixed objects can fly into head and cause. Sever and even lethal outcome, thus passenger must have ability to duck on they place (which also noted in instruction for emergency). Therefore 3 point seatbelt cannot be used as it greatly slows down ducking.

Edit:
On very smal aircafts where potentially heavy luggage is not expected to be in same room as people, passengers commonly have 3 point seatbelt and pilots 4-5point searbelt