Use a rectangular sheet of paper
Fold the paper lengthwise in half
Unfold it and make a sharp center crease
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 crease
Fold each wing down evenly
Keep both wings the same size
Press all folds firmly
Make the wing edges straight and aligned
Adjust the wings slightly upward for stability
Test the plane with a smooth, level throw
Make small adjustments after each flight