This is a paper airplane I made when I didn't get how to make another airplane like this.
Step 1: Half
You'll want a piece of paper(you can use printer paper but graph or notebook paper would be better). First, fold your paper in half.
Step 2: Folding
Fold the a little of the top like in the picture. If your using graph paper then it should be the squares down, notebook paper then the lines down, and if using white paper, measure.
Step 3: Half 2
Now fold in half like in the picture.
Step 4: Picture Fold
Fold both sides like in the picture.
Step 5: Square Airplane
You now have a square airplane. Now decorate.