All through my childhood years my dad used to travel from the US to the UK for three week trips three times a year. We always went on the trips to and from the airport to drop him off and pick him up. My little sister for many years never realised he actually went somewhere. She thought he just climbed on the plane and stayed there for three weeks. So she played "Going to England" and would pack up all her stuffed animals in suitcases, go get on the "plane" (sofa), stay there a bit, and then "come home" again. It was quite a shock to her when she realised he did things other than just sit on the plane for the entire trip.
A childhood belief about aeroplanes

others believed things like this
- I used to believe that when you flushed an aeroplane toilet the waste would just drop out of the plane.Anon
- I used to believe Airplanes were things that made air plane- like took out scents, took out impurities, etc...— Emile
- My friend's sister used to think the auto pilot on a plane was an inflatable man like the one in Airplane!— Richard Davies
- if heavy people went on a plane i thought that it would tip over.— michael hague
- I thought that Heaven was literally up in the sky and you could fly there in a plane— Nate
- when I was little, I was scared of taking the plane because I thought clods were solid !! — valentine a french student in eigth