When the Japanese attacked Pearl Harbor, Hawaii on December 7,1941, there were just 155 Boeing B-17 Flying Fortresses in service. The raid immediately brought the US into the world war and production orders for the B-17, along with a host of other combat aircraft, skyrocketed. To maintain the massive output required, Boeing established additional B-17 production lines with Douglas Aircraft at Long Beach, California and Lockheed Vega at Burbank, California. A grand total of 12,731 B-17s was built by May 1945 in these plants and at Boeing's own Seattle factory.
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