So we're really talking about two things here
(1) Writing down and collecting registration numbers, which I have to admit is a little ...ahem... esoteric
(2) Watching aeroplanes, small and large, learning and collecting information about different types, usage, deployment, development, interesting technical details etc etc.
I worked in the industry for a while and I saw mostly people who didn't really give a crap about aircraft (I was in IT) there were a few that were very engaged in the subject and a broad mifddle ground of people who knew alot, but because it was their job. THey would know all the spark plug types if they worked in an auto parts store.
Having said that, I think the world would be, at the very least a more logical place if industries everywhere were filled with enthusiasts. Then again I really have little love for computers.
I do like the autism + lists vs hormones comment though
