You will need: I simple printer paper.
or any other sized paper in a rectangle shape.

Fold your paper in half.
Sharp the edge with your nail.
Open the paper.
Now you have a very visible line sharing the paper in 2 long rectangles.

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Step 3:

Now place the top right corner over the central line and sharp the bended area with your nail.
Do the same for the top left side the way they get both symmetrical in the center line

Step 5:

Now turn your project back.
Fold your project in the central line the way right attack border and left attack border gets together.

Step 8: Finishing.

Picture of Finishing.
Holding by the central triangle, open up your wings.
That is it!
Hold your plane (no longer called project) by the central triangle and throw it.