It is recommended to use DIN A4 for this paper airplane but I have tested it with letter size and it does not make a big difference. In case you have letter size and want to cut it into DIN A4 size ratio, please follow the second part of this video:    • How to cut A4 size in letter size and...  

Big thanks to Gioele Zanelli for teaching me how to make this incredible paper airplane, it is known to have won Foldable Flight's 2023 contest, and I would not be surprised if it would be a future guiness world record winner!

This glider/dart combination has an incredibly unique design and structure and it has amazed me.