I think its like the theory of McDonalds Resturaunt furniture. McDonalds wanted to call themselves a family resturaunt and yet they didnt want people to overstay thier welcome. So they made the deycor and furniture as uncomfortable as possible. In the helicopter world it is probably this way so we dont get too comfy and get complacent or better yet ,fall asleep. I overcome this problem with a seat cushion that was designed for people bound to wheel chairs. Its called a Roho cushion and you can get one at any medical supplies store. They are quite pricey but worth every penny. After all we only get one spine. Cheers.