- Each year, approximately 58 people in the United States are injured by turbulence while not wearing their seat belts.

- From 1980 through 2008, U.S. air carriers had 234 turbulence accidents, resulting in 298 serious injuries and three fatalities.

- Of the 298 serious injuries, 184 involved flight attendants and 114 involved passengers.

- At least two of the three fatalities involved passengers who were not wearing their seat belts while the seat belt sign was illuminated.

- Generally, two-thirds of turbulence-related accidents occur at or above 30,000 feet.

Edit: These stats do not include general aviation (private jets, etc...).