We actually prefer five-point harnesses, but not all aircraft can accomodate them. Y-belts are a cost-effective upgrade for most models. Nothing is more basic to aircraft and automotive safety than seatbelts. But it took the FAA awhile to figure that out. It wasn't until 1978 that the FAA required all pilot and co-pilot seats to have lap belts and shoulder harnesses. After 1988, all cabin seats were required to have shoulder restraints.
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