[twelve40]

What I find funny is that this year I got to fly newer first class (places I fly to are $1k+ economy and close to $10k first class, so normally I avoid the latter), the type where you get to sit diagonally in your own little "bunk". Despite the whole seat obviously designed for more comfort, the belt had the lap and the shoulder parts, and many times they were much more anal about having both parts buckled up. Guess that's the tradeoff! Typical economy is miserably cramped so they get less restraints to feel a bit better.

[t0mas88]

It depends on the position of the chair, direction and hard surfaces you could hit. A shoulder strap is common on seats that don't face straight forward.