Start with a rectangular sheet of paper
Fold the paper in half lengthwise
Unfold it
Fold the top two corners inward to the center crease
Fold the new top edges inward again to form a narrow point
Fold the plane in half along the center crease
Fold one side down to make a wing
Flip it over and fold the other wing down to match
Adjust both wings so they are even
Slightly bend the back edges of the wings upward for stability