Start with a rectangular sheet of paper
Fold it in half lengthwise
Unfold it
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 the wings down on each side
Make the wing folds even and sharp
Adjust the wing angles slightly upward
Flatten all creases firmly
Test and fine-tune the nose and wings for balance