iFixit

The display assembly is attached to the case with 19 small screws:

Four (relatively) large Torx which screw into the hinges.

Thirteen #00 Phillips which hold down the clutch cover.

And two #00 Phillips which screw into cable ground loops.

Apple made no compromises on the Air's display. Amazingly, the entire display assembly weighs only 465 g (slightly more than a pound), 34 percent less than the functionally-equivalent display assembly on the MacBook.