Eh.

Aluminum is one of the most easily recycled metals, and recycled Al is a lot cheaper than the stuff they need to refine from bauxite ore. Those reused soda cans produce a stock that’s just as pure as the virgin stuff.

Be that as it may, in something as important as an airplane, let’s just stick with the new stuff. There are enough problems with fatigue in aircraft that any chances with less than pure stock should not be taken.

I KNEW I was flying around in a glorified tin can when I was on Southwest Airlines!