This is one my mother actually believed...way into her forties!!
She thought that airplanes had wire hanging down from them for the telephones they had onboard!!! Needless to say she is slightly nutty my Mam!
A childhood belief about aeroplanes

others believed things like this
- My nephew, at around age three, used to say that airplanes trailing white exhaust were "airplanes on strings".— Mojo!
- i used to believe airplanes never land and would just fly forever, i believed in this till 8-9— Tuncay
- When I was little, I believed that sonic booms were from airplanes passing gas! haha!
— coconut - I thought the lines in the sky left behind by airplanes were "sky scrapers". Makes sense.Anon
- My dad told me that the reason Birds didn't get electrocuted on overhead wire was they had rubber feet!!— Derricki
- when i was little, i used to believe that airplanes goes out of space.Anon