On CNN - The World's largest flying machines

From the Spruce Goose to the yet-to-fly Stratolauncher, can you name the World's largest aircraft?

In fact, when it comes to aircraft, there is no single definition of what "largest" means? Is it wingspan? payload? length?...

I explore all these different possibilities to come up with a list of some of the largest machines that have ever flown.

Check it in my piece for CNN...