Airplane Origami Jet. Bring the top and bottom corners of the left side to the middle crease line. Bring the sloping edge to the center line and crease only upper part of the folding line 3 a to b.
This initial crease is simply a guideline for the next folds. Grabbing only the top wing and tail, fold them upwards along an imaginary line between these two. First perform a hotdog style fold, then unfold.