This is one of those things I kind of wonder about the reality of. It's absolutely true that you're unlikely to be able to manufacture a lot of what you'll use during the war.

But simultaneously, it's not like the United States is really trying to fix this problem. The modern generation fighter aircraft are boondoggles with massively inefficient manufacturing designed to win senators and congresspeople votes - not act as the backbone of a hardened supply chain.

They're being built the way they are because the US doesn't seriously expect to face any enemy who can substantially deplete its forces, or is going to have any ability to strike the mainland.

My suspicion is that if there was an actual belief in the need to have reliable supply lines, it could be done and manufacturing could be streamlined a lot. You could definitely imagine a nearly fully automated factory rolling these things off very quickly.