For sharp creases, you can also use a ruler. Hold the paper flat on the table with one hand. Be sure the paper is lined up where you want it. Hold the ruler with the other hand and set it on the middle of the fold you want to crease. Press down and gently pull the ruler out to one end. Then place the ruler back on the middle of the crease and pull it out to the other end.

2torial #0646: Learn2 Make Paper Airplanes (Continued) Method 2: The Basic Glider Make the tricky body folds   Now comes the tricky part: fold over one of the long-edged, folded corners. Its point should touch the center crease about one inch (2.5 cm) up from the point of the triangle. Look at the diagram for placement. Hold it down and crease. Fold down the other folded edge until its point just barely touches the other one. Crease this fold also. The point of the short way fold peeks through and is a short, squat kite shape. (It shouldn't look like a square on its side or a diamond.) Turn the kite shape over the trickily-folded corners and fold it down snugly. The kite shape should hold the corners in place.   The center crease fold: Now pick up the airplane and fold it backwards along the center crease so that the folded kite shape faces out. Keep the folded corners tucked in the little pockets made by the kite shape.   Method 2 - Step 3