I second what Shredder said.
Years and years and years of compiling all kinds of sources.... weeding through them, then finding more, and more.. and thankfully, even more.
What's crazy is finding out that a plane was borrowed, or given to someone else... finding markings painted over from other squadrons (Jastas)... it's really a never-ending process for us to try as hard as we possibly can to get it right.
OvS