A little bit of history. This was at their Inglewood California plant (which is now part of LAX airport).
B25's, NA-73's and AT-6 were in production.
http://latimesblogs.latimes.com/thedailymirror/2011/06/north-american-aviation-strike-part-1.html
I saw this in the LA Times today.
Firefighters engulfed in flames after DC-6 crash
Posted By: Scott Harrison
Posted On: 12:13 a.m. | November 14, 2014
Feb. 8, 1976: Firefighters working to rescue three crew members from a crashed DC-6 cockpit on a golf course near Van Nuys...