One of my favourite things ever when I was a kid was a chapter of one of those Michelin man I spy books, the chapter was on clouds and I learned them all off by heart. My brother was the same except about the one on aeroplanes. Its so nice how kids fixate on things, I still love clouds and and up until 11 or so my mum would drive him to Heathrow just to look at the grounded planes in the observation area, and to this day he could tell you “oh that’s a qantas plane” from what I would just see as a metallic noise blob in the sky