"At one time, airline safety generally meant one thing: avoiding a crash. But safety regulators are increasingly focusing on surviving one.

Starting this fall, all new airplanes will be required to have seats that will stay in place when subjected to stresses up to 16 times the force of gravity. The old seats had to meet stresses of only nine times the force of gravity. And, in a safety measure borrowed from automobiles, some seats will be equipped with air bags.

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