Former Delta Air Lines co-pilot Jonathan J. Dunn has been federally indicted for allegedly threatening to shoot the captain of a commercial flight last year if he diverted the plane due to a medical emergency. The U.S. Department of Transportation Office of the Inspector General said Dunn is facing up to 20 years in prison and a $250,000 fine if convicted. He is currently out on bond and is scheduled to appear in court on Dec. 14.