15 steps. Design © Nick Robinson. www.origami.me.uk
Take a sheet of A4 (or letter) size paper, fold in half sideways to make a crease and unfold.
Fold the paper in half downward and unfold.
Fold the top and bottom edges to meet the center line and unfold.
Fold the right part to the center.
Fold the right bottom corner to the top crease.
Fold the top right corner downward, making the right edge meet the bottom edge.
Fold the right corner to the left.
Tuck the small triangle inside the central flap.
Fold the item in half backward.
Fold the top flap downward slantwise to make the 1st wing.
Make the second wing the same way.
Open the wings.
The Delta is complete! Launch it into the sky!