It makes sense that if you want to build some of the biggest vehicles on the planet, you'll need some of the biggest factories to do it and vehicles don't come much bigger than aircraft. Constructing and testing everything from the shell of the plane to the first class cabin, there are few engineering feats on the planet more complex and impressive. Step inside these gigantic spaces to see what it takes to create aviation wonders.
National Geographic: Megafactories - Aviation Wonders
Airbus. Boeing. Learjet.