Fold a standard sheet of paper in half lengthwise, then unfold
Fold the top two corners to the center crease
Fold the new top edges to the center crease again
Fold the plane in half along the center crease
Fold the wings down on each side to make them even
Add small wing flaps or adjust the wing tips if desired
Use a firm, level throw to test the plane
Try different paper airplane styles by changing the nose shape, wing width, and tail folds
Use a dart style for speed
Use a glider style for distance
Use a wide-wing style for slow, stable flight
Use a folded nose and narrow wings for better stability
Use heavier paper for stronger flights
Use lighter paper for easier folding and slower gliding
Keep folds sharp and symmetrical
Make small adjustments after each test flight