Use a single sheet of standard letter or A4 paper
Fold the paper lengthwise in half, then unfold
Fold the top two corners down to the center crease
Fold the new top edges down to the center crease again
Fold the plane in half along the center crease
Fold each wing down evenly to match the body
Make the wings straight and symmetrical
Add a small upward bend to the back edges of the wings
Sharpen all creases firmly
Test the plane with a gentle straight throw
Adjust wing angles slightly for better glide
Keep both wings and folds balanced on both sides