B-17 Flying Fortress
When this plane was first introduced by Boeing in 1935, it was quickly referred to as a “15-ton flying fortress”. At first, the B-17 was deemed too complex to fly, but once they introduced a pre-flight checklist–which later became a universal technique–it was able to be flown. This powerful plane carried 4,000 pounds of bombs and was the main plane used when the U.S. carried out attacks on Germany. Over 12,000 of these planes were built and used by militaries over the world.
B-17 Flying Fortress
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