Start with a rectangular sheet of paper
Fold the paper in half lengthwise
Unfold it
Fold the top two corners down to the center line
Fold the new top edges down to the center line again
Fold the plane in half along the center line
Fold each wing down so the top edge lines up with the bottom edge of the body
Make both wings even
Fold small winglets up at the back edges of the wings
Press all folds firmly
Throw it level and straight ahead