The C-47 Skytrain is arguably one of the greatest planes of all time. When you look at the complete picture surrounding this aircraft — how many were built, how many still fly, and the effect they had on a war — one could argue that the C-47 is the best transport ever built (not to slight other fantastic planes, like the C-130 Hercules, C-17 Globemaster III, and the C-5 Galaxy).

But what's a plane without a pilot? For every C-47 built, the US needed an able aviator — and there were many built. So, the US developed a massive pipeline to continually train pilots and keep those birds flying.

It make look like a docile floater from afar, but flying a C-47 is a lot harder than you might think. Sure, you're not pulling Gs and trying to blow away some Nazi in a dogfight. In fact, by comparison, flying materiel from point A to point B looks simple, but cargo planes have their own problems that make piloting them very hard work.

And by very hard work, we mean if you screw up, you'll crash and burn.

C-47s performing a simple job — easy flying, right? Wrong. There was a lot that pilots had to keep in mind.

(U.S. Air Force)

Why is that? Well, the big reason is because transport planes haul cargo, which comes with its own hazards. When you load up a plane, it affects the center of gravity and, if the load shifts, the plane can end up in a very bad situation.

This is what happens when it goes wrong - this particular C-47 was hit by flak, but you could crash and burn from shifting cargo or just by messing up.

(Imperial War Museum)

The United States Army Air Force used films to give the thousands of trainees the information needed to fly the over 8,000 C-47s produced by Douglas — and this number doesn't include at least 5,000 built by the Soviet Union under license.

Learn how to handle operations in the cockpit of a C-47 by watching the video below!