The phrase "paper aeroplanes" refers to planes that are made out of paper, like the ones you might fold and fly for fun.
Sentences with «paper aeroplanes»
Making a variety of paper aeroplanes see how long they fly for. (science-sparks.com)
The plaster objects will include objects based on the figure's head, and also several Folded, Unfolded, Sunk and Scanned works which take their shape from an unfolded paper aeroplane. (aestheticamagazine.com)