The B-24 was the most widely produced bomber in world history. This video shows the sole surviving regularly flown example, from roughly 18,000 B-24 Liberator bombers produced. This is the Collings Foundation's B-24, Witchcraft.
During World War II, at peak production, factories put out roughly ten of these aircraft per day. Each was driven by four supercharged turbocharged radials putting out 1,200 horsepower each. Flying with greater range than the B-17 Flying Fortress, the B-24 Liberator bomber could drop about 8,000 pounds of bombs from high- or low-altitude attacks. When WWII's most widely used big bomber went down, it often took all ten crewmen at a time. It was notably involved in the infamous Ploesti raid, in which more than 50 aircraft and 660 crewmen were lost. The surviving men who flew in the bomber and the men and women who produced these historic aircraft are becoming few. Talk to one if you get the chance.