thumb|left|P-38 Lightning assembly line at the Lockheed plant, Burbank, California, in World War II. In June 1943, this assembly line was reconfigured into a mechanized line, which more than doubled the rate of production. The transition to the new system was accomplished in only eight days. During this time production never stopped. It was continued outdoors.Parker 2013, pp. 59, 75–76.
thumb|left|P-38 Lightning assembly line at the Lockheed plant Burbank California in World War II In June 1943 this assembly line was reconfigured into a mechanized line which more than doubled the rate of production The transition to the new system was accomplished in only eight days During this time production never stopped It was continued outdoorsParker 2013 pp 59 75–76