Greg Biffle plane crash NTSB briefing
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The National Transportation Safety Board is investigating the crash at a North Carolina airport, which killed seven people, including the driver Greg Biffle and his wife and children.
The couple, who were killed in a plane crash along with their two children and three others, have a legacy of giving back, Cristina's mother Cathy Grossu tells PEOPLE
Authorities say a business jet crashed while landing at a regional airport in Statesville, North Carolina, erupting in a large fire