[noirbot]

I'm a little surprised, but the weight being roughly the same makes sense. The thickness is a little deceptive. I think they're both measured from their thickest point, but the Framework is essentially a solid brick with only a slight taper on the front and back edge, while the Air tapers to nearly a point on a number of sides. For reference, Apple lists the Air at:

Height: 0.16–0.63 inch (0.41–1.61 cm)

So they're the same thickness at their thickest point, but I'd guess that the Air has much less of the laptop at that thickness. I'd be curious about a volumetric comparison.