Use a standard A4 or letter-sized sheet
Fold the paper lengthwise to make a center crease, then unfold
Fold the top two corners to the center crease
Fold the new top edges to the center crease again
Fold the plane in half along the center crease
Fold each wing down evenly
Make both wings the same size
Keep the folds sharp and crisp
Adjust the wing tips slightly upward
Add a small upward bend to the back edges of the wings
Test the plane with a smooth, level throw
Make small adjustments after each test flight