At the end of Sun ‘n Fun, as I was shooting this video with P-51 owner Louis Horschel, I was marveling at the fact that with only about 100 of these aircraft still flying, it's still supportable. As Horschel explained, parts are findable, if not readily available, and the economics allow the manufacture of some parts. Mustang owners know where to find them, too.
This is a companion discussion topic for the original entry at https://www.avweb.com/flight-safety/will-my-airplane-last-a-century