Mid-air collision between Douglas Aircraft Company non-commercial test flight of DC-7B airliner, N8210H, c/n 45192/764, out of Santa Monica Municipal Airport (intended customer – Continental Airlines), struck by Northrop F-89J Scorpion, 52-1870A, c/n 4447, out of Palmdale, California with companion "target" F-89J, 53-2516A too far ahead to witness incident, all at 25000 feet .