FILE - National Transportation Safety Board investigators David Rayburn, left, and Robert Accetta walk in this Aug. 10, 2008 file photo past a charter bus involved in a deadly accident early Friday that killed 17 people and left at least eight others in critical condition in Sherman, Texas. The owner of the Houston bus company who was charged after a 2008 crash has avoided prison after a federal judge sentenced him to three years of probation in a plea agreement Friday Oct. 24, 2014. (AP Photo/Matt Slocum, File)