John Doe wrote:
But I'm curious about aircraft grade aluminum too. So far I picked
up at least two different numbers (2024, 7075) designating aircraft
grade aluminum, and the idea that metal can be hardened with aging
(didn't know that one).

Thanks to the replies.

In a word or two. Forget the "buzz words" and learn what the
aloy numbers mean and USE them.
...lew...