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Image: Corning The thing to remember is that while glass is more scratch resistant than plastic, it’s not scratchproof — it may scratch at a Mohs hardness of 5 or 6, instead of 2 or 3 for plastic, but it scratches anyhow.

Moving up to the standard Apple Watch gets you a stainless steel chassis and a nearly scratchproof sapphire-covered display.

The screen itself isn’t scratchproof, but LG says it’s more durable than usual with a special chemical layer applied to Corning’s Gorilla Glass.

Nanobots, however, could make diamonds in any shape at all--a sheet a few millimeters thick, say, to make a scratchproof window.

All the 48s have a clever system for easily removing the cabin windows facing the cockpit, and there�s scratchproof storage for both as well.