seat belts in airplanes are not to protect you in a crash (hehe sure)they are to keep you frome bouncing around the cabin in turbulance and hurting other passengers who will sue the airline.
seat belts in buses? they say you will be traped in the bus , won't i be traped in my car??
someone had the idea of mounting the seats backwards in buses and airplanes so the seat absorbs the impact, but someone else thought people would not like to ride backwards, so it was never done.
last note....if you don't wear your car seat belt , you will be arrested, but buses have no belt......thats why we park in the drive way, and drive on the parkway