@Shayman solution nobody asked for: roller-coaster-style seats with over-the-shoulder restraints instead. Solves lots of problems:
- easy to find, just reach up
- everyone's in his seat while the seatbelt sign's on because the stewardess won't unlock him
- no more lawsuits over the seatbelt buckle just saying LIFT and not LEVER
@khird that will help during inverted flight too!