Start with a rectangular sheet of paper
Place the paper flat on a surface
Fold the paper in half lengthwise
Crease the fold firmly
Unfold the paper
Fold the top two corners down to the center line
Crease both folds firmly
Fold the new top edges down to the center line again
Crease firmly
Fold the plane in half along the center line
Keep the folds on the outside
Fold each wing down from the top edge
Make both wings the same size
Crease both wings firmly
Adjust the wings so they are level
Hold the plane by the bottom
Throw it gently forward