In used to think the smoke left by a jet was actually part of the jet. So in other words, I thought jets were REALLY long.
A childhood belief about aeroplanes

others believed things like this
- When I was young, I thought that the smoke that jets leave behind them was how clouds were formed. — Rebecca
- I used to believe that the streams left behind jets were people going to heaven.— kindofadork
- I used to believe that smoke stacks that pumped out white smoke were cloud makers.— lizzie
- When I was younger I thought that the jets that leave lines in the sky were rockets — Harry
- I thought if I left the door open too long, a dog would come from the cupboard in the washroom and eat me
Anon - I used to believe clouds were formed by jets and their exhaust. — Olivia