SUNRIVER, OR -- The National Transportation Safety Board is investigating the Martin Luther King Day plane crash at Sunriver Airport. No one was injured when the plane flipped upside down on a snowbank next to an icy runway. The plane is owned by Leading Edge Flight Academy. The pilot was a licensed student with Leading Edge. The Bend Bulletin reports that Leading Edge Executive Vice President Jack Walker says the passenger was not an instructor and that the school is investigating the incident. Walker says they will submit information about the crash and the damage to the plane to the federal agencies