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Passengers catapulted into the air. look closely at this hole punched in by a passenger's head. in all, 20 injured at the south african airways flight that crossed the equator from johannesburg en route to hong kong. some passengers evacuated in cervical collars. >> hit his head on the top of the roof. >> reporter: turbulence can form in the calmest conditions, often caused by pockets of air. we flew in a simulator in miami. where would you feel the most turbulence in a flight like this? >> in the very back of the airplane. >> reporter: on average, 23 passengers are hurt a year. most of them, ...

Air. look closely at this hole punched in by a passenger's head. in all, 20 injured at the south african airport that equator from johannesburg en route to hong kong. some passengers evacuated in cervical collars. >> hit his head on the top of the roof. >> reporter: turbulence can form in the calmest conditions, often caused by pockets of air. we flew in a simulator in miami. where would you feel the most turbulence in a flight like this? >> in the back of the airplane. >> reporter: on average, 23 passengers are hurt a year. most of them, not wearing seat belts. there is no specific instrument...