I was six years old on my first flight heading to visit the grandparents sitting window over port wing of a DC-6. Only thing kids could do then is look out the window and marvel at the ability to fly. Noticed oil streaming back out of the cowling of the port inner back over the wing during cruise. Tugged on mum's shirt, she flagged down the stew who took a quick look and then went forward. One of the front office came back, leaned over took a look and said in what was classic pilot vernacular 'that's normal for these old buckets but thank you and keep watching it for me' after which I received my first set of wings. I knew what I wanted to do for a living and my doodling in school was airliners from then on - no more trains.