NASCAR's Greg Biffle said to be on downed plane
Retired NASCAR driver Greg Biffle was believed to be on the plane that crashed outside of Charlotte, North Carolina, on Thursday, killing all seven people aboard. He joins a somber roll of athletes who died in plane or helicopter crashes, including fellow race car drivers Alan Kulwicki and Davey Allison, who died in separate accidents 1993. Here are some of the sports figures who died in aviation accidents:
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