it says the thickness can be anywhere from 0.16–0.63 inches (0.41–1.61 cm). And "Size and weight vary by configuration and manufacturing process."
does anyone know what exactly this means? What I want to know is what configurations lead to a thin MacBook Air and what configurations lead to a fat one. A difference of 4x in thickness is huge.

Mac - Compare Models
See what makes each Mac laptop and desktop different. And find the one that’s perfect for your life, your work, and your budget.
www.apple.com
does anyone know what exactly this means? What I want to know is what configurations lead to a thin MacBook Air and what configurations lead to a fat one. A difference of 4x in thickness is huge.