Use a single sheet of standard letter or A4 paper
Fold the paper lengthwise and crease sharply
Unfold and fold the top two corners to the center line
Fold the new top edges to the center line again
Fold the nose down slightly to lock the folds
Fold the top edges to the center line one more time for a narrow nose
Fold the plane in half along the center crease
Make the wings small and even on both sides
Keep the wing edges straight and aligned
Add a slight upward angle to both wings
Make the nose pointed and tight
Press all creases firmly
Trim only if needed for perfect symmetry
Throw it level with a fast, smooth motion