You'd think the MacBook Air would be drastically thinner than its Pro counterpart, but that's not the case.
Quite the contrary; the 2018 MacBook Air is 0.61 inches at its thickest point, and the 13-inch MacBook Pro is actually 0.59 inches at its thickest point, which is slightly thinner than the Air!
(The Air, of course, features a tapered design, so its thinnest point is just 0.16 inches.)