Use a rectangular sheet of paper
Place the paper vertically
Fold the paper in half lengthwise
Crease the fold firmly
Unfold the paper
Fold the top left corner to the center crease
Fold the top right corner to the center crease
Fold the new left slanted edge to the center crease
Fold the new right slanted edge to the center crease
Fold the paper in half along the center crease
Fold one wing down to meet the bottom edge
Flip the paper over
Fold the other wing down to match the first wing
Crease all folds firmly
Hold the airplane from the bottom center
Throw it gently forward